knockout vs stunner

knockout and stunner both are nouns.

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

As nouns, knockout and stunner are synonyms defined as:

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

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

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