mar vs slur

mar and slur both are nouns.

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

As nouns, slur is a hyponym of mar; that is, slur 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)
slur: a blemish made by dirt

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

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