knockout vs sweetheart

knockout and sweetheart both are nouns.

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

As nouns, knockout and sweetheart are synonyms defined as:

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

knockout (noun)	sweetheart (noun)
a blow that renders the opponent unconscious	a person loved by another person
a very attractive or seductive looking woman	a very attractive or seductive looking woman
	any well-liked individual
	a beloved person; used as terms of endearment

knockout (adjective)	sweetheart (adjective)
very strong or vigorous	privileged treatment of a favored person or corporation (sometimes unethically)