efface vs blur

efface is not a noun while blur is a noun.

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

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

Other hypernyms of efface include dim, slur.

efface (noun)	blur (noun)
	a hazy or indistinct representation

efface (verb)	blur (verb)
remove completely from recognition or memory	become vague or indistinct
remove by or as if by rubbing or erasing	make dim or indistinct
make inconspicuous	make unclear, indistinct, or blurred
	make a smudge on; soil by smudging
	to make less distinct or clear
	become glassy; lose clear vision