a woman who speaks for God or a deity, or by divine inspiration.

a woman who foretells future events.

a woman who is aspokesperson of some doctrine, cause, or movement.

the wife or female companion of a prophet.

noun

augur , auspex , diviner , foreteller , haruspex , prophesier , seer , sibyl , soothsayer , vaticinator , anna , cassandra , pythoness , seeress , sorceress