pap vs nipple

pap and nipple both are nouns.

Word	Noun	Adjective	Verb	Adverb
pap	Yes	No	No	No
nipple	Yes	No	No	No

As nouns, pap and nipple are synonyms defined as:

Other synonyms of pap include mamilla, mammilla, teat, tit.

pap (noun)	nipple (noun)
the small projection of a mammary gland	a flexible cap on a baby's feeding bottle or pacifier
worthless or oversimplified ideas	the small projection of a mammary gland
a diet that does not require chewing; advised for those with intestinal disorders