actinomycete vs eubacterium

actinomycete and eubacterium both are nouns.

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

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

actinomycete: any bacteria (some of which are pathogenic for humans and animals) belonging to the order Actinomycetales
eubacterium: a large group of bacteria having rigid cell walls; motile types have flagella

Other hypernyms of actinomycete include eubacteria, true bacteria.

actinomycete (noun)	eubacterium (noun)
any bacteria (some of which are pathogenic for humans and animals) belonging to the order Actinomycetales	a large group of bacteria having rigid cell walls; motile types have flagella