parer vs paring knife

parer and paring knife both are nouns.

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

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

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

parer (noun)	paring knife (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