paring knife vs parer

paring knife and parer both are nouns.

Word	Noun	Adjective	Verb	Adverb
paring knife	Yes	No	No	No
parer	Yes	No	No	No

As nouns, paring knife and parer are synonyms defined as:

paring knife and parer: a small sharp knife used in paring fruits or vegetables

paring knife (noun)	parer (noun)
a small sharp knife used in paring fruits or vegetables	a small sharp knife used in paring fruits or vegetables
	a manicurist who trims the fingernails