stunner vs knockout

stunner and knockout both are nouns.

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

As nouns, stunner and knockout are synonyms defined as:

Other synonyms of stunner include beauty, dish, looker, lulu, mantrap, peach, ravisher, smasher, sweetheart.

stunner (noun)	knockout (noun)
an unexpected and amazing event	a blow that renders the opponent unconscious
a very attractive or seductive looking woman	a very attractive or seductive looking woman

stunner (adjective)	knockout (adjective)
	very strong or vigorous