streptococci vs eubacterium

streptococci and eubacterium both are nouns.

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

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

streptococci: spherical Gram-positive bacteria occurring in pairs or chains; cause e.g. scarlet fever and tonsillitis
eubacterium: a large group of bacteria having rigid cell walls; motile types have flagella

Other hypernyms of streptococci include eubacteria, true bacteria.

streptococci (noun)	eubacterium (noun)
spherical Gram-positive bacteria occurring in pairs or chains; cause e.g. scarlet fever and tonsillitis	a large group of bacteria having rigid cell walls; motile types have flagella