sweetheart vs looker

sweetheart and looker both are nouns.

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

As nouns, sweetheart and looker are synonyms defined as:

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

sweetheart (noun)	looker (noun)
a person loved by another person	a very attractive or seductive looking woman
a very attractive or seductive looking woman	a close observer; someone who looks at something (such as an exhibition of some kind)
any well-liked individual
a beloved person; used as terms of endearment

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