mycobacteria vs eubacteria

mycobacteria and eubacteria both are nouns.

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

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

mycobacteria: rod-shaped bacteria some saprophytic or causing diseases
eubacteria: a large group of bacteria having rigid cell walls; motile types have flagella

Other hypernyms of mycobacteria include eubacterium, true bacteria.

mycobacteria (noun)	eubacteria (noun)
rod-shaped bacteria some saprophytic or causing diseases	a large group of bacteria having rigid cell walls; motile types have flagella