sibyl vs prophet

sibyl and prophet both are nouns.

Word	Noun	Adjective	Verb	Adverb
sibyl	Yes	No	No	No
prophet	Yes	No	No	No

As nouns, prophet is a hypernym of sibyl; that is, prophet is a word with a broader meaning than sibyl:

Other hypernyms of sibyl include oracle, prophesier, seer, vaticinator.

sibyl (noun)	prophet (noun)
(ancient Rome) a woman who was regarded as an oracle or prophet	an authoritative person who divines the future
a woman who tells fortunes	someone who speaks by divine inspiration; someone who is an interpreter of the will of God