spirochaete vs eubacterium

spirochaete and eubacterium both are nouns.

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

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

spirochaete: parasitic or free-living bacteria; many pathogenic to humans and other animals
eubacterium: a large group of bacteria having rigid cell walls; motile types have flagella

Other hypernyms of spirochaete include eubacteria, true bacteria.

spirochaete (noun)	eubacterium (noun)
parasitic or free-living bacteria; many pathogenic to humans and other animals	a large group of bacteria having rigid cell walls; motile types have flagella