There are a total of 568 9-letter words ending in 'on', and the number may vary in different dictionaries. You can specify the dictionary and order.
- abduction 18
- abjection 25
- abolition 14
- abruption 17
- accession 16
- accordion 17
- accretion 16
- actuation 14
- acylation 16
- addiction 15
- adduction 16
- admission 14
- adoration 11
- adulation 13
- advection 18
- affection 19
- afternoon 14
- agflation 16
- agitation 12
- allaction 15
- animation 14
- anthelion 14
- anthemion 16
- anticodon 15
- antiunion 13
- apportion 16
- ascension 14
- aspersion 13
- assertion 10
- asyndeton 14
- attention 11
- attrition 10
- automaton 14
- avocation 17
- badminton 18
- bajillion 24
- bandoneon 16
- bandwagon 20
- barperson 16
- barracoon 16
- battalion 14
- bazillion 24
- bijection 25
- bioregion 15
- bioweapon 19
- bisection 16
- bolection 17
- bombardon 20
- bupropion 20
- cacodemon 20
- caparison 16
- carbanion 17
- carnation 14
- caseation 13
- cassation 13
- causation 14
- centurion 15
- cessation 13
- chalazion 25
- chameleon 19
- chawbacon 24
- chelation 16
- ciliation 14
- coalition 14
- cognation 16
- cognition 16
- colcannon 19
- collation 15
- collision 15
- collodion 16
- collusion 16
- commotion 19
- communion 21
- companion 20
- concision 17
- condition 15
- confusion 18
- connexion 22
- contagion 16
- contusion 15
- corrasion 13
- corrosion 13
- cotillion 15
- cotyledon 17
- cremation 16
- crenation 14
- criterion 13
- cyclotron 19
- damnation 15
- dandelion 14
- dealation 12
- decathlon 17
- deception 17
- decillion 16
- decoction 17
- deduction 16
- defection 17
- deflation 15
- deflexion 22
- dejection 23
- demission 14
- dentition 12
- depiction 17
- depletion 15
- desertion 11
- detection 14
- detention 12
- detorsion 11
- detrition 11
- deviation 15
- dictation 14
- diffusion 18
- digestion 13
- dimension 15
- direction 14
- diversion 15
- dodecagon 17
- doubleton 16
- ecoregion 15
- ectropion 16
- education 15
- effluxion 25
- egression 12
- eirenicon 14
- elevation 15
- elocution 15
- emanation 14
- emulation 15
- encrimson 17
- entropion 14
- ephemeron 18
- epilation 14
- erudition 12
- evocation 17
- evolution 16
- exception 23
- exclusion 22
- excretion 20
- excursion 21
- execution 21
- exemption 23
- expansion 21
- expiation 20
- explosion 21
- expulsion 22
- exsertion 17
- extension 18
- extortion 17
- extrusion 18
- exudation 19
- fellation 15
- filiation 14
- flotation 14
- foliation 14
- formation 16
- furcation 17
- gammadion 19
- gazillion 23
- gemmation 18
- gerfalcon 19
- gestation 12
- gradation 13
- guncotton 17
- gustation 13
- guttation 13
- gyrfalcon 21
- habergeon 17
- hackathon 21
- halogeton 15
- honeymoon 18
- hortation 12
- hyaenodon 16
- hydration 15
- ichneumon 20
- iguanodon 15
- imitation 13
- immersion 16
- impaction 19
- impassion 16
- implosion 17
- impulsion 18
- inanition 12
- incaution 15
- inception 17
- inclusion 16
- incursion 15
- indention 13
- indiction 15
- induction 16
- infection 17
- inflation 15
- inflexion 22
- ingestion 13
- injection 23
- insertion 11
- intension 12
- intention 12
- intrusion 12
- intuition 12
- inunction 16
- invention 16
- inversion 15
- irruption 14
- isolation 11
- iteration 10
- kazillion 25
- keybutton 20
- lactation 14
- lallation 13
- lamington 17
- laudation 13
- layperson 16
- legomenon 17
- libration 14
- lineation 12
- liquation 21
- magnetron 16
- malathion 16
- medaillon 16
- medallion 16
- mediation 14
- mellotron 15
- mentation 14
- midseason 14
- migration 15
- misbutton 17
- misreckon 20
- modillion 16
- mousseron 14
- multipion 18
- muskmelon 22
- narration 11
- nervation 15
- nictation 14
- nitration 11
- nonaction 15
- nonillion 14
- nonperson 15
- nutrition 12
- obduction 18
- objection 25
- obsession 13
- obtention 14
- obtrusion 14
- obversion 17
- obviation 17
- occlusion 18
- octillion 15
- offseason 16
- olecranon 15
- olfaction 17
- operation 13
- orpharion 15
- ovulation 16
- oxidation 18
- ozonation 20
- pademelon 18
- palmation 17
- palpation 17
- pantaloon 15
- parathion 15
- parhelion 16
- partition 13
- penillion 16
- penstemon 17
- percheron 18
- perdition 14
- perfusion 17
- persimmon 19
- pervasion 17
- phelonion 17
- phonation 16
- pickaroon 20
- pinnation 15
- placation 17
- planation 15
- plication 17
- pollution 16
- postilion 14
- precision 16
- predation 14
- prelusion 15
- prenotion 14
- preseason 13
- prevision 17
- privation 17
- proaction 16
- probation 16
- profusion 17
- prolusion 15
- promotion 16
- pronation 14
- proration 13
- protozoon 22
- provision 17
- puftaloon 18
- pulsation 15
- purgation 16
- quotation 20
- radiation 11
- rebellion 15
- reblochon 19
- recaption 16
- recension 14
- reception 16
- recession 13
- reclusion 15
- recursion 14
- redaction 14
- reduction 15
- reedition 11
- refashion 15
- refection 16
- reflation 14
- reflexion 21
- reggaeton 14
- rejection 22
- reliction 14
- remission 13
- rendition 12
- repletion 14
- repulsion 15
- resection 13
- retention 11
- retortion 10
- reveillon 16
- reversion 14
- revulsion 16
- rockmelon 21
- ruination 12
- saltation 11
- salvation 15
- saskatoon 14
- satiation 10
- saucisson 14
- scuncheon 20
- scutcheon 19
- secession 13
- seclusion 15
- secretion 13
- seduction 15
- selection 14
- semicolon 17
- sensation 11
- septation 13
- seriation 10
- serration 10
- siltation 11
- simpleton 17
- singleton 14
- situation 11
- solenodon 13
- solvation 15
- sortition 10
- soupspoon 17
- sphenodon 17
- sporozoon 22
- squillion 22
- stanchion 16
- striation 10
- subdeacon 18
- sublation 15
- submicron 20
- subregion 16
- suffusion 18
- summation 17
- supermoon 17
- suspicion 17
- synkaryon 19
- talkathon 17
- tarnation 11
- technikon 20
- testation 10
- thereupon 16
- thyratron 14
- titration 10
- tradition 11
- triathlon 13
- trihedron 13
- trilithon 13
- truncheon 17
- ululation 14
- undecagon 18
- urination 12
- usucapion 18
- valuation 16
- variation 14
- vastation 14
- vermilion 18
- vernation 15
- vibration 17
- violation 15
- vitiation 14
- walkathon 20
- whereupon 19
- ademption 14
- arcuation 11
- bilection 13
- caudation 12
- clavation 14
- connation 11
- cornichon 16
- cosmotron 13
- cupferron 16
- darnation 10
- deceleron 12
- dentation 10
- detrusion 10
- divulsion 13
- exsection 18
- freemason 14
- impletion 13
- incretion 11
- jactation 18
- lanthanon 12
- nunnation 9
- outreason 9
- outreckon 15
- peltation 11
- pendragon 13
- phonathon 17
- phytotron 17
- prefixion 21
- preoption 13
- recaution 11
- restation 9
- retorsion 9
- scalation 11
- sconcheon 16
- sinuation 9
- striction 11
- suffixion 22
- sulcation 11
- sulfation 12
- tellurion 9
- tierceron 11
- vallation 12
- vendition 13
- accension 13
- afflation 15
- affluxion 22
- alectryon 14
- apathaton 14
- arenation 9
- attuition 9
- balection 13
- bandoleon 12
- bandonion 12
- basilicon 13
- brondyron 15
- chaetodon 15
- chiliagon 15
- clarendon 12
- coemption 15
- curtation 11
- curvation 14
- decession 12
- decursion 12
- defluxion 20
- delapsion 12
- demersion 12
- detersion 10
- detortion 10
- diachylon 18
- diacodion 13
- diplozoon 21
- discommon 16
- disprison 12
- dormition 12
- emication 13
- emplecton 15
- emunction 13
- encheason 14
- encolpion 13
- endecagon 13
- endungeon 11
- epinicion 13
- epinikion 15
- epitheton 14
- epulation 11
- epuration 11
- evagation 13
- evanition 12
- evitation 12
- exaration 16
- excambion 22
- exoration 16
- falcation 14
- faulchion 17
- foetation 12
- frigatoon 13
- galdragon 12
- gammation 14
- grivation 13
- hacqueton 23
- hydrozoon 25
- idioticon 12
- immission 13
- implexion 20
- influxion 19
- insection 11
- intorsion 9
- intortion 9
- irisation 9
- jawbation 21
- jerfalcon 21
- largition 10
- latration 9
- livraison 12
- luctation 11
- mactation 13
- mandilion 12
- mandylion 15
- melocoton 13
- melungeon 12
- metarchon 16
- miniation 11
- monoxylon 21
- musketoon 15
- neuration 9
- obreption 13
- obvention 14
- padymelon 17
- pandation 12
- pantaleon 11
- pertusion 11
- pinkerton 15
- pollusion 11
- prelation 11
- premotion 13
- procaryon 16
- prokaryon 18
- prolation 11
- prooemion 13
- propodeon 14
- pyramidon 17
- quintroon 18
- quotition 18
- raciation 11
- radiothon 13
- reboation 11
- reguerdon 11
- reptation 11
- resnatron 9
- rhipidion 15
- ructation 11
- scutation 11
- semantron 11
- sigmation 12
- sigmatron 12
- sociation 11
- sortation 9
- spiration 11
- stasidion 10
- sticheron 14
- stramacon 13
- stramazon 20
- subaction 13
- synedrion 13
- tabellion 11
- tenaillon 9
- tentation 9
- tortillon 9
- tricerion 11
- trisagion 10
- troparion 11
- vacuation 14
- witwanton 15
There are 568 9-letter words ending in on in the well-known word game dictionary, 406 in the Scrabble US (US/Canada/Thailand - TWL/NWL) dictionary, and 552 in the Scrabble UK (International - SOWPODS/CSW) dictionary, and 395 in the Words with Friends (WWF) dictionary.
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