dad vs papa

dad and papa both are nouns.

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

As nouns, dad and papa are synonyms defined as:

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

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

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