mar vs nevus

mar and nevus both are nouns.

Word	Noun	Adjective	Verb	Adverb
mar	Yes	No	Yes	No
nevus	Yes	No	No	No

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

mar: a mark or flaw that spoils the appearance of something (especially on a person's body)
nevus: a blemish on the skin that is formed before birth

mar (noun)	nevus (noun)
a mark or flaw that spoils the appearance of something (especially on a person's body)	a blemish on the skin that is formed before birth

mar (verb)	nevus (verb)
destroy or injure severely
make imperfect