dent vs mar

dent and mar both are nouns.

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

As nouns, mar is a hypernym of dent; that is, mar is a word with a broader meaning than dent:

dent: an impression in a surface (as made by a blow)
mar: a mark or flaw that spoils the appearance of something (especially on a person's body)

Other hypernyms of dent include blemish, defect.

dent (noun)	mar (noun)
an impression in a surface (as made by a blow)	a mark or flaw that spoils the appearance of something (especially on a person's body)
an appreciable consequence (especially a lessening)
a depression scratched or carved into a surface

dent (verb)	mar (verb)
make a depression into	destroy or injure severely
	make imperfect