papa vs pa

papa and pa both are nouns.

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

As nouns, papa and pa are synonyms defined as:

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

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