sulfur bacteria vs thiobacillus

sulfur bacteria and thiobacillus both are nouns.

Word	Noun	Adjective	Verb	Adverb
sulfur bacteria	Yes	No	No	No
thiobacillus	Yes	No	No	No

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

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

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