eubacterium vs eubacteria

eubacterium and eubacteria both are nouns.

Word	Noun	Adjective	Verb	Adverb
eubacterium	Yes	No	No	No
eubacteria	Yes	No	No	No

As nouns, eubacterium and eubacteria are synonyms defined as:

eubacterium and eubacteria: a large group of bacteria having rigid cell walls; motile types have flagella

Other synonyms of eubacterium include true bacteria.

eubacterium (noun)	eubacteria (noun)
a large group of bacteria having rigid cell walls; motile types have flagella	a large group of bacteria having rigid cell walls; motile types have flagella