There are a total of 217 9-letter words ending in 'um', and the number may vary in different dictionaries. You can specify the dictionary and order.
- adstratum 14
- aluminium 19
- americium 19
- anthodium 17
- anthurium 17
- antiserum 14
- arboretum 16
- asphaltum 19
- athenaeum 16
- avizandum 28
- bacterium 19
- berkelium 21
- beryllium 20
- botulinum 19
- bronchium 22
- bubblegum 26
- calcaneum 21
- caldarium 18
- calvarium 21
- capitulum 21
- carbonium 20
- castoreum 16
- cerastium 16
- claustrum 18
- clitellum 19
- coccidium 23
- coenobium 20
- colchicum 25
- collegium 20
- colluvium 23
- collyrium 20
- colosseum 17
- colostrum 17
- columbium 24
- consultum 19
- contagium 19
- continuum 19
- conundrum 20
- credendum 19
- cribellum 21
- criterium 16
- ctenidium 18
- cubiculum 25
- cymbidium 25
- decennium 19
- dentalium 16
- deuterium 15
- diazonium 24
- dichasium 19
- doronicum 18
- effluvium 25
- endosteum 15
- epicedium 20
- epimedium 20
- epimysium 21
- equisetum 23
- euphonium 20
- fastigium 18
- flabellum 22
- flagellum 21
- fraenulum 19
- gelsemium 19
- germanium 19
- gymnasium 21
- gynaeceum 21
- gynaecium 21
- gynoecium 21
- harmonium 19
- herbarium 18
- hospitium 18
- hydronium 19
- hypericum 23
- impluvium 25
- indecorum 18
- infinitum 18
- joliotium 23
- laconicum 21
- lanthanum 18
- ligustrum 17
- magnesium 19
- manubrium 21
- marsupium 20
- mausoleum 18
- mazaedium 26
- menstruum 18
- molluscum 22
- mortarium 16
- neodymium 20
- neptunium 19
- nitrenium 15
- nitronium 15
- nymphaeum 24
- operculum 21
- opusculum 22
- palladium 19
- paramylum 22
- perpetuum 20
- petroleum 17
- plutonium 19
- pollinium 19
- polygonum 22
- potassium 16
- practicum 22
- presidium 17
- pterygium 20
- pycnidium 23
- pyrethrum 20
- reptilium 17
- responsum 17
- reticulum 18
- rhizobium 27
- rostellum 15
- rotulorum 15
- ruthenium 17
- sacrarium 16
- sanctorum 17
- sargassum 15
- sarmentum 17
- scutellum 19
- sensillum 16
- sensorium 14
- septarium 16
- sexennium 22
- spirillum 18
- stomodeum 17
- strontium 14
- subphylum 25
- sugarplum 20
- sulfonium 19
- sympodium 22
- symposium 21
- syncytium 21
- synsacrum 19
- tegmentum 19
- tellurium 16
- tenaculum 19
- tentorium 14
- terrarium 13
- trapezium 25
- triennium 15
- trifolium 17
- triforium 16
- ultimatum 18
- unguentum 19
- uredinium 16
- uropygium 21
- vademecum 24
- verbascum 23
- vestigium 19
- ytterbium 18
- zirconium 26
- ecomuseum 15
- elaterium 11
- hedysarum 18
- hordeolum 15
- nelumbium 15
- pastorium 13
- trisodium 12
- unununium 11
- achaenium 16
- anoestrum 11
- arbitrium 13
- asplenium 13
- avisandum 15
- barathrum 16
- castellum 13
- collodium 14
- combretum 17
- cormidium 16
- deliquium 21
- desmodium 15
- diachylum 20
- diacodium 15
- diatretum 12
- drepanium 14
- ectropium 15
- emplectum 17
- encolpium 15
- entropium 13
- epilobium 15
- excambium 24
- excerptum 22
- gastraeum 12
- glucinium 14
- helvetium 17
- hieracium 16
- hypogaeum 20
- magnalium 14
- martyrium 16
- perinaeum 13
- pomoerium 15
- prescutum 15
- prooemium 15
- propodeum 16
- prytaneum 16
- purdonium 14
- quaesitum 20
- quercetum 22
- reddendum 14
- rhipidium 17
- saccharum 18
- sagapenum 14
- salicetum 13
- separatum 13
- sporidium 14
- submentum 15
- synangium 15
- synedrium 15
- taraxacum 20
- tormentum 13
- tripudium 14
- vaccinium 18
- virginium 15
- viticetum 16
- vulsellum 14
- zoocytium 25
- zygantrum 24
There are 217 9-letter words ending in um in the well-known word game dictionary, 136 in the Scrabble US (US/Canada/Thailand - TWL/NWL) dictionary, and 198 in the Scrabble UK (International - SOWPODS/CSW) dictionary, and 151 in the Words with Friends (WWF) dictionary.
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