dad vs daddy

dad and daddy both are nouns.

Word	Noun	Adjective	Verb	Adverb
dad	Yes	No	No	No
daddy	Yes	No	No	No

As nouns, dad and daddy are synonyms defined as:

dad and daddy: an informal term for a father; probably derived from baby talk

Other synonyms of dad include dada, pa, papa, pappa, pop.

dad (noun)	daddy (noun)
an informal term for a father; probably derived from baby talk	an informal term for a father; probably derived from baby talk