There are a total of 1256 9-letter words containing 'io', and the number may vary in different dictionaries. You can specify the dictionary and order.
- abduction 18
- abiogenic 18
- abjection 25
- ablations 14
- ablutions 15
- abolition 14
- abortions 13
- abrasions 13
- abruption 17
- accession 16
- accordion 17
- accretion 16
- acromions 16
- actioners 13
- actioning 16
- actuation 14
- acylation 16
- adaptions 14
- addiction 15
- additions 12
- adduction 16
- adhesions 13
- admission 14
- adnations 12
- adoptions 14
- adoration 11
- adulation 13
- advection 18
- aerations 10
- aetiology 14
- affection 19
- affusions 17
- agflation 16
- agiotages 13
- agitation 12
- agnations 13
- allaction 15
- allusions 13
- alluvions 17
- ambitions 16
- ambitious 16
- amphioxus 25
- anabiosis 13
- anabiotic 16
- angiogram 17
- angiomata 15
- animation 14
- anthelion 14
- anthemion 16
- antiunion 13
- anxiously 21
- aperiodic 16
- aphelions 16
- apportion 16
- apriorism 15
- apriority 14
- arational 11
- arpeggios 16
- arsenious 11
- arteriole 10
- ascension 14
- aspersion 13
- assertion 10
- atrocious 13
- attention 11
- attrition 10
- auctioned 15
- audacious 15
- audiobook 18
- audiogram 16
- audiology 16
- audiotape 14
- auditions 12
- aversions 14
- aviations 14
- avocation 17
- avulsions 16
- axiomatic 22
- bajillion 24
- bastioned 14
- battalion 14
- bazillion 24
- behaviors 18
- behaviour 19
- bibliotic 19
- bicurious 17
- bijection 25
- biliously 17
- billionth 17
- bioactive 19
- bioassays 14
- bioclasts 16
- biocycles 21
- biodiesel 14
- bioenergy 17
- bioethics 17
- biogasses 14
- biogenies 15
- biogenous 16
- biography 21
- biohazard 24
- biolistic 16
- biologics 18
- biologies 15
- biologism 18
- biologist 15
- biomarker 19
- biomasses 15
- biometric 18
- biomorphs 20
- bionomics 19
- bionomies 16
- biopharma 20
- biophilia 18
- biopiracy 20
- bioplasms 19
- biopsying 20
- bioregion 15
- biorhythm 21
- biosafety 17
- bioscopes 18
- biosensor 13
- biosocial 16
- biosolids 14
- biosphere 17
- biotoxins 20
- bioweapon 19
- bisection 16
- bocaccios 21
- bodacious 17
- bolection 17
- braciolas 16
- bracioles 16
- briolette 13
- bumptious 20
- bupropion 20
- cabrioles 16
- cabriolet 16
- calliopes 17
- capacious 19
- capriccio 21
- caprioled 17
- caprioles 16
- captioned 17
- carbanion 17
- cardioids 14
- cariosity 14
- carnation 14
- carpaccio 21
- carrioles 13
- caseation 13
- cassation 13
- causation 14
- cautioned 15
- centriole 14
- centurion 15
- cessation 13
- chalazion 25
- champions 21
- charioted 15
- cheerioed 15
- chelation 16
- chorioids 15
- chorionic 18
- ciliation 14
- cioppinos 19
- citations 13
- clarioned 15
- coactions 16
- coalition 14
- coercions 16
- cognation 16
- cognition 16
- cohesions 15
- coitional 14
- collation 15
- collision 15
- collodion 16
- collusion 16
- commotion 19
- communion 21
- companion 20
- conations 14
- concision 17
- condition 15
- confusion 18
- connexion 22
- conscious 17
- contagion 16
- contusion 15
- cooptions 16
- copiously 19
- corrasion 13
- corrosion 13
- cotillion 15
- creations 13
- cremation 16
- crenation 14
- criterion 13
- curations 14
- curculios 18
- curiosity 15
- curiouser 14
- curiously 17
- cushioned 17
- damnation 15
- dandelion 14
- dealation 12
- deception 17
- decillion 16
- decisions 14
- decoction 17
- decurions 15
- deduction 16
- defection 17
- deflation 15
- deflexion 22
- deionised 12
- deioniser 11
- deionises 11
- deionized 21
- deionizer 20
- deionizes 20
- dejection 23
- delations 12
- deletions 12
- delicious 15
- delirious 12
- delusions 13
- demission 14
- demotions 14
- dentition 12
- depiction 17
- depletion 15
- derations 11
- derisions 11
- desertion 11
- detection 14
- detention 12
- detorsion 11
- detrition 11
- deviation 15
- deviously 18
- devotions 15
- dictation 14
- dictional 15
- diffusion 18
- digestion 13
- dilations 12
- dilutions 13
- diluvions 17
- dimension 15
- diobolons 15
- diocesans 14
- dioecious 14
- dioecisms 16
- dioestrus 11
- diogenite 13
- diolefins 15
- diopsides 14
- diopsidic 17
- dioptases 13
- dioptrics 16
- diosgenin 14
- direction 14
- disunions 13
- diversion 15
- divisions 15
- dominions 15
- donations 12
- dotations 11
- doupionis 15
- dubiously 18
- durations 12
- eclosions 14
- ecoregion 15
- ectropion 16
- education 15
- eductions 15
- effluxion 25
- effusions 17
- egestions 12
- egregious 14
- egression 12
- ejections 22
- elections 14
- elevation 15
- elocution 15
- emanation 14
- emersions 13
- emissions 13
- emotional 14
- emulation 15
- emulsions 15
- enactions 14
- entropion 14
- enviously 18
- envisions 15
- epilation 14
- equations 20
- erections 13
- eriophyid 17
- erosional 11
- erudition 12
- eruptions 14
- espionage 15
- estradiol 11
- ethionine 13
- etiolated 11
- etiolates 10
- etiologic 15
- evections 17
- eversions 14
- evictions 17
- evocation 17
- evolution 16
- evulsions 16
- exactions 20
- excelsior 20
- exception 23
- excisions 20
- exclusion 22
- excretion 20
- excursion 21
- execution 21
- exemption 23
- exertions 17
- expansion 21
- expiation 20
- explosion 21
- expulsion 22
- exsertion 17
- extension 18
- exteriors 16
- extortion 17
- extrusion 18
- exudation 19
- facetious 16
- factional 17
- falchions 19
- fashioned 16
- fashioner 15
- fellation 15
- fellatios 14
- felonious 15
- fenthions 16
- ferocious 16
- fetations 13
- fictional 17
- filiation 14
- finocchio 21
- finochios 18
- fioritura 13
- fioriture 13
- fissional 14
- fissioned 14
- fixations 20
- flections 17
- flotation 14
- fluxional 23
- foliation 14
- formation 16
- fractions 16
- fractious 16
- frictions 16
- fruitions 14
- fugacious 19
- functions 18
- furacious 17
- furcation 17
- furiously 17
- fusionism 17
- fusionist 14
- gabionage 17
- gammadion 19
- ganglions 16
- gazillion 23
- gelations 13
- gemmation 18
- geraniols 13
- gestation 12
- gladiolas 14
- gladiolus 15
- glorioles 13
- gloriosus 13
- gnathions 15
- graciosos 14
- gradation 13
- grandiose 13
- grandioso 13
- guaiocums 19
- gumptions 19
- gustation 13
- guttation 13
- gyrations 14
- hagiology 18
- halations 13
- heliogram 17
- heliostat 12
- heliotype 17
- heliozoan 22
- hemiolias 15
- hilarious 13
- himations 15
- hortation 12
- hydration 15
- hydriodic 18
- ideations 11
- idioblast 14
- idiolects 14
- idiomatic 16
- idiopathy 17
- idiophone 16
- idiotical 14
- idiotisms 13
- idiotypes 15
- ignitions 13
- ignoratio 12
- illations 12
- illusions 13
- imbroglio 18
- imitation 13
- immersion 16
- impaction 19
- impassion 16
- imperious 16
- impiously 19
- implosion 17
- impulsion 18
- inactions 14
- inanition 12
- incaution 15
- inception 17
- incisions 14
- inclusion 16
- incurious 15
- incursion 15
- indention 13
- indiction 15
- induction 16
- infection 17
- inferiors 13
- infixions 21
- inflation 15
- inflexion 22
- infusions 15
- ingenious 14
- ingestion 13
- inhesions 13
- injection 23
- injurious 21
- insertion 11
- insidious 12
- intaglios 13
- intension 12
- intention 12
- interiors 10
- intrusion 12
- intuition 12
- inunction 16
- invasions 15
- invention 16
- inversion 15
- invidious 16
- inviolacy 20
- inviolate 15
- iodations 11
- iodinated 12
- iodinates 11
- iodoforms 16
- iodometry 15
- iodophors 15
- iodopsins 14
- ionically 17
- ionisable 14
- ionizable 23
- ionopause 14
- ionophore 15
- iotacisms 15
- irruption 14
- isolation 11
- iteration 10
- joliotium 23
- judicious 24
- junctions 24
- juniorate 20
- juniority 22
- kazillion 25
- laborious 14
- lactation 14
- lallation 13
- laudation 13
- lavations 15
- laxations 18
- legations 13
- legionary 15
- leiothrix 19
- lenitions 12
- libations 14
- libecchio 21
- libeccios 19
- libration 14
- ligations 13
- lineation 12
- lionesses 11
- lionheads 14
- lionheart 13
- lionisers 11
- lionising 14
- lionizers 20
- lionizing 23
- liquation 21
- litigious 13
- lobations 14
- locations 14
- locutions 15
- lotharios 12
- lunations 13
- luxations 19
- luxurious 20
- maiolicas 16
- malarious 14
- malathion 16
- malicious 17
- mandiocas 17
- medallion 16
- mediation 14
- meiofauna 17
- meliorate 13
- meliorism 16
- meliorist 13
- melodions 15
- melodious 15
- menadione 15
- mentation 14
- mentioned 15
- mentioner 14
- migration 15
- milliohms 19
- millionth 17
- minacious 17
- missioned 14
- missioner 13
- misunions 15
- modillion 16
- monecious 17
- monitions 14
- motioners 13
- motioning 16
- mullioned 17
- multipion 18
- munitions 15
- mustachio 18
- mutations 14
- myriopods 18
- narration 11
- natations 11
- nationals 12
- nefarious 14
- negations 13
- nervation 15
- nictation 14
- nidations 12
- nitration 11
- nonaction 15
- nonillion 14
- nonrioter 11
- nonunions 14
- notations 11
- notorious 11
- novations 15
- noxiously 21
- nutations 12
- nutrition 12
- obduction 18
- objection 25
- oblations 14
- oblivions 18
- oblivious 18
- obnoxious 21
- obsession 13
- obtention 14
- obtrusion 14
- obversion 17
- obviation 17
- obviously 20
- occasions 16
- occlusion 18
- octillion 15
- oestriols 10
- officious 19
- olfaction 17
- omissions 13
- onionskin 16
- operation 13
- ophiolite 15
- opinioned 15
- optionals 14
- optionees 13
- optioning 16
- oratorios 9
- orpharion 15
- ovarioles 14
- ovulation 16
- oxidation 18
- oxyanions 20
- ozonation 20
- palmation 17
- palpation 17
- parathion 15
- parhelion 16
- partition 13
- passional 14
- pasticcio 18
- patriotic 15
- pavilions 18
- penillion 16
- pensioned 15
- pensioner 14
- pensiones 14
- penurious 15
- perdition 14
- pereiopod 16
- perfusion 17
- periodate 13
- periodids 14
- periodise 13
- periodize 22
- periostea 12
- pervasion 17
- petiolate 13
- petiolule 15
- petitions 13
- phelonion 17
- phonation 16
- pinioning 17
- pinnation 15
- pioneered 14
- piosities 12
- piousness 14
- pistachio 17
- placation 17
- planation 15
- plication 17
- pliosaurs 14
- pliotrons 14
- pollution 16
- portfolio 16
- portioned 14
- positions 13
- posterior 12
- postilion 14
- potations 13
- prebiotic 18
- precision 16
- predation 14
- prelusion 15
- prenotion 14
- presidios 13
- preunions 15
- prevision 17
- priorates 12
- priorship 17
- privation 17
- proaction 16
- probation 16
- probiotic 18
- profusion 17
- prolusion 15
- promotion 16
- pronation 14
- propionic 19
- proration 13
- provision 17
- pulsation 15
- punctilio 18
- punitions 15
- pupations 17
- purgation 16
- quarrions 20
- questions 20
- quotation 20
- radiation 11
- radicchio 18
- radiogram 15
- radiology 15
- radionics 14
- radiowave 17
- rapacious 16
- rationale 11
- rationals 11
- rationing 13
- reactions 13
- rebellion 15
- recaption 16
- recension 14
- reception 16
- recession 13
- recisions 13
- reclusion 15
- recursion 14
- redaction 14
- reduction 15
- reedition 11
- refashion 15
- refection 16
- reflation 14
- reflexion 21
- regionals 13
- rejection 22
- relations 11
- reliction 14
- religions 13
- religiose 12
- religious 13
- remission 13
- remotions 13
- rendition 12
- repletion 14
- repulsion 15
- resection 13
- retention 11
- retortion 10
- reversion 14
- revisions 14
- revulsion 16
- riotously 13
- rogations 12
- rosoglios 12
- rotations 10
- ruination 12
- sagacious 15
- salacious 14
- saltation 11
- salvation 15
- sanctions 14
- satiation 10
- scabiosas 15
- scagliola 16
- scallions 15
- scansions 14
- scenarios 13
- sciolisms 16
- sciolists 13
- scissions 13
- scoliomas 16
- scolioses 13
- scoliosis 13
- scoliotic 16
- scorpioid 16
- scorpions 16
- scullions 16
- secession 13
- seclusion 15
- secretion 13
- sectional 14
- sectioned 14
- sedations 11
- seditions 11
- seditious 11
- seduction 15
- seigniors 12
- seigniory 14
- selection 14
- semeiotic 15
- semiology 17
- semiotics 15
- seniority 12
- sensation 11
- sepiolite 13
- septation 13
- seraglios 12
- seriation 10
- seriously 13
- serration 10
- sessional 11
- silicious 14
- siltation 11
- situation 11
- skiorings 16
- sociogram 17
- sociolect 16
- sociology 17
- sociopath 17
- solations 11
- solfeggio 17
- solutions 12
- solvation 15
- sorptions 13
- sortition 10
- sponsions 14
- squillion 22
- stallions 12
- stanchion 16
- stational 11
- stationed 11
- stationer 10
- stictions 13
- striation 10
- sublation 15
- subperiod 17
- subregion 16
- suctional 15
- suctioned 15
- sudations 12
- suffusion 18
- summation 17
- superiors 13
- suspicion 17
- swaptions 16
- symbionts 18
- symbioses 17
- symbiosis 17
- symbiotes 17
- symbiotic 20
- tarnation 11
- taxations 17
- tediously 14
- tenacious 14
- tensional 12
- tensioned 12
- tensioner 11
- testation 10
- thermions 15
- thionates 12
- thionines 13
- thiophene 17
- thiophens 17
- thiotepas 14
- thioureas 12
- titration 10
- torsional 11
- tractions 13
- tradition 11
- trillions 12
- trioxides 17
- trunnions 13
- tuitional 12
- ululation 14
- uncurious 16
- unenvious 17
- unionised 13
- unionises 12
- unionisms 15
- unionists 12
- unionized 22
- unionizes 21
- unserious 12
- urination 12
- urushiols 14
- usucapion 18
- vacations 17
- vagarious 16
- valuation 16
- variation 14
- varioloid 15
- variolous 15
- variorums 17
- variously 17
- vastation 14
- venations 15
- veracious 17
- vermilion 18
- vernation 15
- versional 15
- versioned 15
- vexations 21
- vexatious 21
- vibration 17
- vibrionic 20
- vibrioses 16
- vibriosis 16
- vicarious 17
- viciously 20
- violaters 14
- violating 17
- violation 15
- violative 18
- violators 14
- violences 18
- violently 18
- violinist 15
- viologens 17
- viomycins 22
- visionary 16
- visioning 17
- vitiation 14
- vitrioled 15
- vitriolic 17
- vivacious 21
- vocations 17
- volitions 15
- volutions 16
- voracious 17
- zabaiones 22
- zillionth 23
- zonations 20
- ademption 14
- ambagious 14
- anabioses 11
- angiology 14
- arcuation 11
- autecious 11
- bifarious 14
- bilection 13
- biocenose 13
- biochemic 20
- biofouler 14
- biofueled 15
- biometers 13
- bionomist 13
- biopirate 13
- biostrome 13
- bioterror 11
- bioturbed 14
- biowastes 14
- blennioid 12
- cassiopes 13
- caudation 12
- cautioner 11
- ciliolate 11
- clarionet 11
- clavation 14
- connation 11
- darnation 10
- dentation 10
- detrusion 10
- dionysiac 15
- dionysian 13
- divulsion 13
- douppioni 14
- dubiosity 15
- embroglio 14
- evasional 12
- exsection 18
- fermionic 16
- fioratura 12
- flexional 19
- foliolate 12
- gladiolar 11
- gumptious 14
- halobiont 14
- heliotypy 20
- heliozoic 23
- idioplasm 14
- idiotypic 17
- impletion 13
- incretion 11
- innoxious 16
- ionogenic 12
- ionosonde 10
- jactation 18
- jillionth 19
- junioring 17
- leiomyoma 16
- lesioning 10
- missional 11
- nunnation 9
- ophiology 18
- ovational 12
- pastitsio 11
- peltation 11
- perniones 11
- pleiocene 13
- pleiotaxy 21
- pliofilms 16
- portioner 11
- prefixion 21
- preoption 13
- recaution 11
- restation 9
- retorsion 9
- reviolate 12
- scalation 11
- selenious 9
- semipious 13
- sinuation 9
- striction 11
- suffixion 22
- sulcation 11
- sulfation 12
- taleggios 11
- tellurion 9
- thallious 12
- unionizer 18
- vallation 12
- variolate 12
- variolite 12
- vendition 13
- viosterol 12
- accension 13
- actionist 11
- adoptious 12
- aerobiont 11
- afflation 15
- affluxion 22
- agriology 14
- allerions 9
- amniotomy 16
- anamniote 11
- annexions 16
- aphidious 15
- apriorist 11
- apsidiole 12
- arenation 9
- aspidioid 13
- astucious 11
- attuition 9
- audiophil 15
- avoisions 12
- balection 13
- bandonion 12
- besognios 12
- bibacious 15
- bibations 13
- bioblasts 13
- biographs 17
- biomining 14
- bioparent 13
- biophores 16
- bioplasts 13
- biostable 13
- biostatic 13
- biotrophs 16
- borachios 16
- caliology 15
- capuccios 17
- cautionry 14
- cibations 13
- cilicious 13
- coemption 15
- coniology 15
- copatriot 13
- coraggios 13
- cullionly 14
- curtation 11
- curvation 14
- cushionet 14
- decession 12
- decursion 12
- defluxion 20
- delapsion 12
- demersion 12
- detersion 10
- detortion 10
- diacodion 13
- dicacious 14
- dioptrate 12
- dioristic 12
- dormition 12
- dosiology 14
- ebionised 12
- ebionises 11
- ebionisms 13
- ebionitic 13
- ebionized 21
- ebionizes 20
- ebriosity 14
- editioned 11
- elaiosome 11
- emication 13
- emictions 13
- emptional 13
- emunction 13
- encolpion 13
- epibioses 13
- epibiosis 13
- epibiotic 15
- epinicion 13
- epinikion 15
- epulation 11
- epuration 11
- epyllions 14
- eriometer 11
- erionites 9
- etherions 12
- ethiopses 14
- evagation 13
- evanition 12
- evitation 12
- exaration 16
- excambion 22
- exoration 16
- falcation 14
- fasciolas 14
- fascioles 14
- fauchions 17
- faulchion 17
- feracious 14
- filioques 21
- finnochio 17
- foetation 12
- foliolose 12
- furiosity 15
- gabionade 13
- galiongee 11
- gammation 14
- gladioles 11
- gloriosas 10
- grillions 10
- grivation 13
- gumphions 17
- hariolate 12
- heliodors 13
- heliology 16
- hemiopias 16
- hemiopsia 16
- histrions 12
- idiograms 13
- idiograph 16
- idiotcies 12
- idioticon 12
- illisions 9
- immission 13
- implexion 20
- indubious 12
- inebrious 11
- influxion 19
- insection 11
- intorsion 9
- intortion 9
- inustions 9
- iodophile 15
- iodyrites 13
- ionotropy 14
- irisation 9
- irrisions 9
- jawbation 21
- jobations 18
- koniology 17
- largition 10
- latration 9
- limations 11
- lioncelle 11
- lixivious 19
- luctation 11
- mactation 13
- mandilion 12
- mandiocca 16
- mandylion 15
- meiocytes 16
- meionites 11
- meiospore 13
- meliority 14
- miniation 11
- minutiose 11
- motionist 11
- mycobiont 18
- myiophily 22
- myriorama 16
- nauplioid 12
- neuration 9
- nivations 12
- noctilios 11
- nodations 10
- nolitions 9
- notionist 9
- nudations 10
- obreption 13
- obvention 14
- onioniest 9
- orillions 9
- ostiolate 9
- pacations 13
- pactional 13
- pactioned 14
- panchions 16
- pandation 12
- parecious 13
- passioned 12
- pecunious 13
- periodide 13
- perioding 13
- periotics 13
- pertusion 11
- pillioned 12
- pizzaiola 29
- pleiomery 16
- pollusion 11
- porphyrio 19
- prelation 11
- premotion 13
- prescious 13
- pressions 11
- prolation 11
- pronuncio 13
- prooemion 13
- pulvilios 14
- pulvillio 14
- quotition 18
- raciation 11
- radiogold 12
- radiothon 13
- rangioras 10
- reboation 11
- refusions 12
- regionary 13
- religioso 10
- reptation 11
- rhipidion 15
- ructation 11
- sciomachy 21
- sciomancy 18
- sciophyte 19
- sciosophy 19
- scontions 11
- scurriour 11
- scutation 11
- sigmation 12
- simonious 11
- sitiology 13
- skillions 13
- sociation 11
- solacious 11
- sortation 9
- spadillio 12
- spiration 11
- spongiose 12
- spongious 12
- stasidion 10
- stellions 9
- stillions 9
- stradiots 10
- subaction 13
- subpriors 13
- synecious 14
- synedrion 13
- tabellion 11
- taglionis 10
- tediosity 13
- tenebrios 11
- tentation 9
- thiofuran 15
- timariots 11
- tricerion 11
- triecious 11
- trioleins 9
- trionymal 14
- trioxygen 20
- trisagion 10
- troparion 11
- tutiorism 11
- tutiorist 9
- unanxious 16
- unioniser 9
- unobvious 14
- vacuation 14
- versioner 12
- viciosity 17
- villagios 13
- violented 13
- visioners 12
- visionist 12
- vitiosity 15
- vocalions 14
- zoobiotic 22
There are 1256 9-letter words containing io in the well-known word game dictionary, 943 in the Scrabble US (US/Canada/Thailand - TWL/NWL) dictionary, and 1224 in the Scrabble UK (International - SOWPODS/CSW) dictionary, and 897 in the Words with Friends (WWF) dictionary.
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