spirillum vs eubacterium

spirillum and eubacterium both are nouns.

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

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

spirillum: any flagellated aerobic bacteria having a spirally twisted rodlike form
eubacterium: a large group of bacteria having rigid cell walls; motile types have flagella

Other hypernyms of spirillum include eubacteria, true bacteria.

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

spirillum: spirally twisted elongate rodlike bacteria usually living in stagnant water
eubacterium: a large group of bacteria having rigid cell walls; motile types have flagella

Other hypernyms of spirillum include eubacteria, true bacteria.

spirillum (noun)	eubacterium (noun)
any flagellated aerobic bacteria having a spirally twisted rodlike form	a large group of bacteria having rigid cell walls; motile types have flagella
spirally twisted elongate rodlike bacteria usually living in stagnant water