vibrion vs eubacterium

vibrion and eubacterium both are nouns.

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

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

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

Other hypernyms of vibrion include eubacteria, true bacteria.

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