critic vs music critic

critic and music critic both are nouns.

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

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

critic: a person who is professionally engaged in the analysis and interpretation of works of art
music critic: a critic of musical performances

Other hyponyms of critic include art critic, drama critic, theater critic, literary critic, newspaper critic.

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