thiobacillus vs eubacteria

thiobacillus and eubacteria both are nouns.

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

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

thiobacillus: small rod-shaped bacteria living in sewage or soil and oxidizing sulfur
eubacteria: a large group of bacteria having rigid cell walls; motile types have flagella

Other hypernyms of thiobacillus include eubacterium, true bacteria.

thiobacillus (noun)	eubacteria (noun)
small rod-shaped bacteria living in sewage or soil and oxidizing sulfur	a large group of bacteria having rigid cell walls; motile types have flagella