nitrosobacteria vs eubacteria

nitrosobacteria and eubacteria both are nouns.

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

As nouns, eubacteria is a hypernym of nitrosobacteria; that is, eubacteria is a word with a broader meaning than nitrosobacteria:

nitrosobacteria: soil bacteria that oxidize ammonia to nitrites
eubacteria: a large group of bacteria having rigid cell walls; motile types have flagella

Other hypernyms of nitrosobacteria include eubacterium, true bacteria.

nitrosobacteria (noun)	eubacteria (noun)
soil bacteria that oxidize ammonia to nitrites	a large group of bacteria having rigid cell walls; motile types have flagella