dearest vs dear

dearest and dear both are nouns.

Word	Noun	Adjective	Verb	Adverb
dearest	Yes	No	No	No
dear	Yes	Yes	No	Yes

As nouns, dearest and dear are synonyms defined as:

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

dearest (noun)	dear (noun)
a beloved person; used as terms of endearment	a beloved person; used as terms of endearment
	a sweet innocent mild-mannered person (especially a child)

dearest (adjective)	dear (adjective)
	with or in a close or intimate relationship
	having a high price
	dearly loved
	sincerely earnest

dearest (adverb)	dear (adverb)
	at a great cost
	with affection