smutch vs blur

smutch is not a noun while blur is a noun.

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

As verbs, smutch and blur are synonyms defined as:

Other synonyms of smutch include smear, smudge.

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

smutch (verb)	blur (verb)
make a smudge on; soil by smudging	become vague or indistinct
	make dim or indistinct
	make unclear, indistinct, or blurred
	make a smudge on; soil by smudging
	to make less distinct or clear
	become glassy; lose clear vision