stunner vs stun

stunner is a noun but stun is not a noun.

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

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

stunner (verb)	stun (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