critic vs carper

critic and carper both are nouns.

Word	Noun	Adjective	Verb	Adverb
critic	Yes	No	No	No
carper	Yes	No	No	No

As nouns, carper is a hyponym of critic; that is, carper is a word with a more specific, narrower meaning than critic:

critic: someone who frequently finds fault or makes harsh and unfair judgments
carper: someone who constantly criticizes in a petty way

Other hyponyms of critic include niggler, nitpicker, roaster.

critic (noun)	carper (noun)
a person who is professionally engaged in the analysis and interpretation of works of art	someone who constantly criticizes in a petty way
anyone who expresses a reasoned judgment of something
someone who frequently finds fault or makes harsh and unfair judgments