streptococcus vs eubacteria

streptococcus and eubacteria both are nouns.

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

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

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

Other hypernyms of streptococcus include eubacterium, true bacteria.

streptococcus (noun)	eubacteria (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