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9-Letter Words Ending with UM

For word games needing UM suffixes, here's your 9-letter word resource. Popular examples include ALUMINIUM, AMERICIUM, ANTHODIUM, plus ANTHURIUM, ANTISERUM, ARBORETUM and many more. Use the table below to find the perfect word for your game.

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122 words

Word	Length	Syllables
aluminium	9	4
americium	9	4
anthodium	9	3
anthurium	9	3
antiserum	9	4
arboretum	9	4
asphaltum	9	3
athenaeum	9	3
bacterium	9	3
berkelium	9	3
beryllium	9	3
botulinum	9	4
bronchium	9	2
bubblegum	9	3
calcaneum	9	3
caldarium	9	3
calvarium	9	3
capitulum	9	4
castoreum	9	3
claustrum	9	2
clitellum	9	3
coccidium	9	3
colchicum	9	3
collegium	9	3
colluvium	9	3
collyrium	9	3
colosseum	9	3
colostrum	9	3
columbium	9	3
contagium	9	3
continuum	9	3
conundrum	9	3
credendum	9	3
criterium	9	3
ctenidium	9	3
cubiculum	9	4
cymbidium	9	3
decennium	9	3
dentalium	9	3
deuterium	9	3
diazonium	9	3
dichasium	9	3
doronicum	9	4
effluvium	9	3
endosteum	9	3
epicedium	9	4
epimysium	9	4
equisetum	9	4
euphonium	9	3
flabellum	9	3
flagellum	9	3
gelsemium	9	3
germanium	9	3
gymnasium	9	3
gynaeceum	9	3
gynaecium	9	3
gynoecium	9	3
harmonium	9	3
herbarium	9	3
hospitium	9	3
hydronium	9	3
indecorum	9	4
lanthanum	9	3
magnesium	9	3
manubrium	9	3
marsupium	9	3
mausoleum	9	3
mazaedium	9	3
menstruum	9	2
neodymium	9	3
neptunium	9	3
operculum	9	4
opusculum	9	4
palladium	9	3
paramylum	9	4
petroleum	9	3
plutonium	9	3
pollinium	9	3
polygonum	9	4
potassium	9	3
practicum	9	3
presidium	9	3
pterygium	9	3
pycnidium	9	3
pyrethrum	9	3
reptilium	9	3
responsum	9	3
reticulum	9	4
rhizobium	9	3
rostellum	9	3
ruthenium	9	3
sacrarium	9	3
sargassum	9	3
sarmentum	9	3
scutellum	9	3
sensillum	9	3
sensorium	9	3
septarium	9	3
spirillum	9	3
stomodeum	9	3
strontium	9	2
subphylum	9	3
sugarplum	9	3
sulfonium	9	3
sympodium	9	3
symposium	9	3
syncytium	9	3
tegmentum	9	3
tellurium	9	3
tenaculum	9	4
terrarium	9	3
trapezium	9	3
triennium	9	2
trifolium	9	3
triforium	9	3
ultimatum	9	4
unguentum	9	3
uredinium	9	4
uropygium	9	4
vestigium	9	3
ytterbium	9	3
zirconium	9	3

FAQs

What’s typical about UM-ending words?
UM often marks suffix families; think about derivatives when guessing.

Do you include UK/US spellings?
Where they exist, both may appear.