bacillus vs eubacterium

bacillus and eubacterium both are nouns.

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

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

bacillus: aerobic rod-shaped spore-producing bacterium; often occurring in chainlike formations; found primarily in soil
eubacterium: a large group of bacteria having rigid cell walls; motile types have flagella

Other hypernyms of bacillus include eubacteria, true bacteria.

bacillus (noun)	eubacterium (noun)
aerobic rod-shaped spore-producing bacterium; often occurring in chainlike formations; found primarily in soil	a large group of bacteria having rigid cell walls; motile types have flagella