thiobacteria vs thiobacillus

thiobacteria and thiobacillus both are nouns.

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

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

thiobacteria: any bacterium of the genus Thiobacillus
thiobacillus: small rod-shaped bacteria living in sewage or soil and oxidizing sulfur

thiobacteria (noun)	thiobacillus (noun)
any bacterium of the genus Thiobacillus	small rod-shaped bacteria living in sewage or soil and oxidizing sulfur