prophetess vs seer

prophetess and seer both are nouns.

Word	Noun	Adjective	Verb	Adverb
prophetess	Yes	No	No	No
seer	Yes	No	No	No

As nouns, seer is a hypernym of prophetess; that is, seer is a word with a broader meaning than prophetess:

Other hypernyms of prophetess include oracle, prophesier, prophet, vaticinator, adult female, woman.

prophetess (noun)	seer (noun)
a woman prophet	a person with unusual powers of foresight
	an authoritative person who divines the future
	an observer who perceives visually