Countable Nouns That Start with AR and End with UM

Explore 11 verified English countable nouns starting with AR and ending with UM, including Arboretum, Arum, Arcanum, Armamentarium, Argumentum, Archegonium and Archaebacterium. Sort these count nouns with singular and plural forms by word length for ESL grammar practice, determiner usage, and plural spelling below, or review singular and plural count rules in our noun grammar guide.

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Starts with ARB
2 words
arboretum
arbitrium
Starts with ARC
5 words
arcanum
archegonium
archaebacterium
arctium
archesporium
Starts with ARG
2 words
argumentum
argyranthemum
Starts with ARM
1 words
armamentarium
Starts with ARU
1 words
arum

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