clostridium vs eubacteria

clostridium and eubacteria both are nouns.

Word	Noun	Adjective	Verb	Adverb
clostridium	Yes	No	No	No
eubacteria	Yes	No	No	No

As nouns, eubacteria is a hypernym of clostridium; that is, eubacteria is a word with a broader meaning than clostridium:

clostridium: spindle-shaped bacterial cell especially one swollen at the center by an endospore
eubacteria: a large group of bacteria having rigid cell walls; motile types have flagella

Other hypernyms of clostridium include eubacterium, true bacteria.

clostridium (noun)	eubacteria (noun)
spindle-shaped bacterial cell especially one swollen at the center by an endospore	a large group of bacteria having rigid cell walls; motile types have flagella