Nouns Ending in UM and Containing SS

Browse 21 valid English nouns ending in UM and containing SS, from Potassium, Possum, Opossum, Sargassum, Alyssum, Hassium and Pessimum 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 A
2 words
alyssum
appressorium
Starts with C6 words
colosseum
crissum
cynoglossum
crassamentum
cassiopeium
coeloglossum
Starts with E
1 words
emissarium
Starts with F
1 words
fideicommissum
Starts with G
1 words
grassum
Starts with H
1 words
hassium
Starts with O4 words
opossum
ossarium
osteoglossum
odontoglossum
Starts with P3 words
potassium
possum
pessimum
Starts with S
2 words
sargassum
scissorium

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