smasher vs knockout

smasher and knockout both are nouns.

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

As nouns, smasher and knockout are synonyms defined as:

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

smasher (noun)	knockout (noun)
a conspicuous success	a blow that renders the opponent unconscious
a very attractive or seductive looking woman	a very attractive or seductive looking woman
a person who smashes something

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