borrelia vs spirochaete

borrelia and spirochaete both are nouns.

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

As nouns, spirochaete is a hypernym of borrelia; that is, spirochaete is a word with a broader meaning than borrelia:

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

Other hypernyms of borrelia include spirochete.

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