slur vs mar

slur and mar both are nouns.

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

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

slur: a blemish made by dirt
mar: a mark or flaw that spoils the appearance of something (especially on a person's body)

Other hypernyms of slur include blemish, defect.

slur (noun)	mar (noun)
a blemish made by dirt	a mark or flaw that spoils the appearance of something (especially on a person's body)
a disparaging remark
(music) a curved line spanning notes that are to be played legato

slur (verb)	mar (verb)
become vague or indistinct	destroy or injure severely
utter indistinctly	make imperfect
speak disparagingly of; e.g., make a racial slur
play smoothly or legato