truelove vs sweetheart

truelove and sweetheart both are nouns.

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

As nouns, truelove and sweetheart are synonyms defined as:

Other synonyms of truelove include steady, sweetie.

truelove (noun)	sweetheart (noun)
a person loved by another person	a person loved by another person
	a very attractive or seductive looking woman
	any well-liked individual
	a beloved person; used as terms of endearment

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