reviewer vs critic

reviewer and critic both are nouns.

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

As nouns, critic is a hypernym of reviewer; that is, critic is a word with a broader meaning than reviewer:

reviewer: someone who reads manuscripts and judges their suitability for publication
critic: anyone who expresses a reasoned judgment of something

reviewer (noun)	critic (noun)
a writer who reports and analyzes events of the day	a person who is professionally engaged in the analysis and interpretation of works of art
someone who reads manuscripts and judges their suitability for publication	anyone who expresses a reasoned judgment of something
	someone who frequently finds fault or makes harsh and unfair judgments