listeria vs true bacteria

listeria and true bacteria both are nouns.

Word	Noun	Adjective	Verb	Adverb
listeria	Yes	No	No	No
true bacteria	Yes	No	No	No

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

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

Other hypernyms of listeria include eubacteria, eubacterium.

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