priestess vs woman

priestess and woman both are nouns.

Word	Noun	Adjective	Verb	Adverb
priestess	Yes	No	No	No
woman	Yes	No	No	No

As nouns, woman is a hypernym of priestess; that is, woman is a word with a broader meaning than priestess:

Other hypernyms of priestess include priest, adult female.

priestess (noun)	woman (noun)
a woman priest	women as a class
	an adult female person (as opposed to a man)
	a female person who plays a significant role (wife or mistress or girlfriend) in the life of a particular man