blur vs efface

blur is a noun but efface is not a noun.

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

As verbs, efface is a hyponym of blur; that is, efface is a word with a more specific, narrower meaning than blur:

Other hyponyms of blur include obliterate.

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

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