stun vs stunner

stun is not a noun while stunner is a noun.

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

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

stun (verb)	stunner (verb)
make senseless or dizzy by or as if by a blow
hit something or somebody as if with a sandbag
overcome as with astonishment or disbelief