listeria vs eubacterium

listeria and eubacterium both are nouns.

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

As nouns, eubacterium is a hypernym of listeria; that is, eubacterium is a word with a broader meaning than listeria:

listeria: any species of the genus Listeria
eubacterium: a large group of bacteria having rigid cell walls; motile types have flagella

Other hypernyms of listeria include eubacteria, true bacteria.

listeria (noun)	eubacterium (noun)
any species of the genus Listeria	a large group of bacteria having rigid cell walls; motile types have flagella