nitrosobacteria vs nitrous bacteria

nitrosobacteria and nitrous bacteria both are nouns.

Word	Noun	Adjective	Verb	Adverb
nitrosobacteria	Yes	No	No	No
nitrous bacteria	Yes	No	No	No

As nouns, nitrosobacteria and nitrous bacteria are synonyms defined as:

nitrosobacteria and nitrous bacteria: soil bacteria that oxidize ammonia to nitrites

nitrosobacteria (noun)	nitrous bacteria (noun)
soil bacteria that oxidize ammonia to nitrites	soil bacteria that oxidize ammonia to nitrites