nitric bacteria vs eubacterium

nitric bacteria and eubacterium both are nouns.

Word	Noun	Adjective	Verb	Adverb
nitric bacteria	Yes	No	No	No
eubacterium	Yes	No	No	No

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

nitric bacteria: soil bacteria that convert nitrites to nitrates
eubacterium: a large group of bacteria having rigid cell walls; motile types have flagella

Other hypernyms of nitric bacteria include eubacteria, true bacteria.

nitric bacteria (noun)	eubacterium (noun)
soil bacteria that convert nitrites to nitrates	a large group of bacteria having rigid cell walls; motile types have flagella