Nouns Starting with O and Containing UM

Browse 61 valid English nouns starting with O and containing UM, from Optimum, Opium, Opossum, Overconsumption, Ovum, Opprobrium and Odium to rarer terms. Check definitions and spelling below, or visit our noun grammar guide to review pluralization and capitalization rules.

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Starts with OA
1 words
oakum
Starts with OB
1 words
obumbration
Starts with OC
1 words
oceanarium
Starts with OD3 words
odium
odeum
odontoglossum
Starts with OF
1 words
offscum
Starts with OI
1 words
oidium
Starts with OL
2 words
oleum
olibanum
Starts with OM5 words
omnium
omentum
omasum
ommatidium
ommateum
Starts with ON3 words
onium
oncidium
onychium
Starts with OO
1 words
oogonium
Starts with OP11 words
optimum
opium
opossum
opprobrium
operculum
oppidum
opusculum
opiumism
opsonium
ophidiarium
ophthalmophyllum
Starts with OR8 words
organum
orichalcum
origanum
ornithogalum
orarium
organistrum
orontium
ordalium
Starts with OS9 words
osmium
ostium
osculum
osmiridium
ostensorium
osteospermum
ossarium
osmeterium
osteoglossum
Starts with OU
1 words
ouma
Starts with OV11 words
overconsumption
ovum
overtrump
ovalbumin
overaccumulation
overbumptiousness
overnumerousness
overpresumptuousness
overpresumptiveness
overcircumspection
overargumentativeness
Starts with OX
2 words
oxonium
oxypetalum

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