vibrio vs eubacterium

vibrio and eubacterium both are nouns.

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

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

vibrio: curved rodlike motile bacterium
eubacterium: a large group of bacteria having rigid cell walls; motile types have flagella

Other hypernyms of vibrio include eubacteria, true bacteria.

vibrio (noun)	eubacterium (noun)
curved rodlike motile bacterium	a large group of bacteria having rigid cell walls; motile types have flagella