spirochete vs borrelia

spirochete and borrelia both are nouns.

Word	Noun	Adjective	Verb	Adverb
spirochete	Yes	No	No	No
borrelia	Yes	No	No	No

As nouns, borrelia is a hyponym of spirochete; that is, borrelia is a word with a more specific, narrower meaning than spirochete:

spirochete: parasitic or free-living bacteria; many pathogenic to humans and other animals
borrelia: cause of e.g. European and African relapsing fever

Other hyponyms of spirochete include treponema, Borrelia burgdorferi, Lime disease spirochete, leptospira.

spirochete (noun)	borrelia (noun)
parasitic or free-living bacteria; many pathogenic to humans and other animals	cause of e.g. European and African relapsing fever