clostridium vs true bacteria

clostridium and true bacteria both are nouns.

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

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

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

Other hypernyms of clostridium include eubacteria, eubacterium.

clostridium (noun)	true bacteria (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