spirilla vs eubacterium

spirilla and eubacterium both are nouns.

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

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

spirilla: 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 spirilla include eubacteria, true bacteria.

spirilla (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