efface vs slur

efface is not a noun while slur is a noun.

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

As verbs, slur is a hypernym of efface; that is, slur is a word with a broader meaning than efface:

Other hypernyms of efface include blur, dim.

efface (noun)	slur (noun)
	a blemish made by dirt
	a disparaging remark
	(music) a curved line spanning notes that are to be played legato

efface (verb)	slur (verb)
remove completely from recognition or memory	become vague or indistinct
remove by or as if by rubbing or erasing	utter indistinctly
make inconspicuous	speak disparagingly of; e.g., make a racial slur
	play smoothly or legato