stunner vs woman

stunner and woman both are nouns.

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

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

Other hypernyms of stunner include adult female.

stunner (noun)	woman (noun)
an unexpected and amazing event	women as a class
a very attractive or seductive looking woman	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