sweetheart vs smasher

sweetheart and smasher both are nouns.

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

As nouns, sweetheart and smasher are synonyms defined as:

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

sweetheart (noun)	smasher (noun)
a person loved by another person	a conspicuous success
a very attractive or seductive looking woman	a very attractive or seductive looking woman
any well-liked individual	a person who smashes something
a beloved person; used as terms of endearment

sweetheart (adjective)	smasher (adjective)
privileged treatment of a favored person or corporation (sometimes unethically)