nipple vs pap

nipple and pap both are nouns.

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

As nouns, nipple and pap are synonyms defined as:

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

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