honey vs sweetheart

honey and sweetheart both are nouns.

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

As nouns, honey and sweetheart are synonyms defined as:

Other synonyms of honey include baby, beloved, darling, dear, dearest, dearie, deary, love, sweetie.

honey (noun)	sweetheart (noun)
a sweet yellow liquid produced by bees	a person loved by another person
a beloved person; used as terms of endearment	a very attractive or seductive looking woman
	any well-liked individual
	a beloved person; used as terms of endearment

honey (adjective)	sweetheart (adjective)
of something having the color of honey	privileged treatment of a favored person or corporation (sometimes unethically)

honey (verb)	sweetheart (verb)
sweeten with honey