spirillum vs true bacteria

spirillum and true bacteria both are nouns.

Word	Noun	Adjective	Verb	Adverb
spirillum	Yes	No	No	No
true bacteria	Yes	No	No	No

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

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

Other hypernyms of spirillum include eubacteria, eubacterium.

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

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

Other hypernyms of spirillum include eubacteria, eubacterium.

spirillum (noun)	true bacteria (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