darling vs baby

darling and baby both are nouns.

Word	Noun	Adjective	Verb	Adverb
darling	Yes	Yes	No	No
baby	Yes	No	Yes	No

As nouns, darling and baby are synonyms defined as:

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

darling (noun)	baby (noun)
a special loved one	a project of personal concern to someone
a beloved person; used as terms of endearment	a very young mammal
	a very young child (birth to 1 year) who has not yet begun to walk or talk
	the youngest member of a group (not necessarily young)
	an immature childish person
	an unborn child; a human fetus
	a beloved person; used as terms of endearment

darling (adjective)	baby (adjective)
dearly loved

darling (verb)	baby (verb)
	treat with excessive indulgence