Countable Nouns Ending in UM and Containing ON

Explore 109 verified English countable nouns ending in UM and containing ON, including Consortium, Continuum, Condominium, Conundrum, Pandemonium, Honorarium and Harmonium. Browse these count nouns with singular and plural forms below, or review singular and plural count rules in our noun grammar guide.

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Starts with A
9 words
aconitum
archegonium
aeonium
anhalonium
aeroperitoneum
androconium
androgonium
ascogonium
androgonidium
Starts with B
6 words
bonum
bronchium
brontotherium
benzenediazonium
brontozoum
bronteum
Starts with C
19 words
consortium
continuum
condominium
conundrum
conservatorium
conium
charmonium
conidium
conarium
chondrocranium
carbonium
chelidonium
contagium
cronartium
chrysogonum
chondroseptum
coccogonium
cycloconium
carpogonium
Starts with D
4 words
demonstrandum
diazonium
doronicum
diaconicum
Starts with E
12 words
euphonium
endoneurium
eponychium
erythronium
eriogonum
endodontium
epitonium
endoconidium
erythrogonium
endogonidium
entobronchium
exogonium
Starts with G
2 words
gonium
gonidium
Starts with H
6 words
honorarium
harmonium
hypochondrium
hydronium
hydroxonium
hormogonium
Starts with L
3 words
leontopodium
limonium
laconicum
Starts with M
4 words
muonium
monopodium
monochasium
macrozoogonidium
Starts with N
3 words
nonpetroleum
nitronium
nipponanthemum
Starts with O
8 words
onium
oogonium
oncidium
oxonium
onychium
odontoglossum
orontium
opsonium
Starts with P
19 words
pandemonium
peritoneum
positronium
pelargonium
propionibacterium
pronotum
perichondrium
phosphonium
pneumoperitoneum
polygonum
perionychium
polemonium
perigonium
peponium
purdonium
polygonatum
pleuroperitoneum
pycnoconidium
parthenogonidium
Starts with R
2 words
responsum
radiostrontium
Starts with S
8 words
syngonium
stramonium
spermatogonium
sulfonium
syconium
spermogonium
sporogonium
siphonium
Starts with T
1 words
tetramethylammonium
Starts with V
2 words
veronicastrum
verumontanum
Starts with Z
1 words
zoogonidium

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