smudge vs blur

smudge and blur both are nouns.

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

As verbs, smudge and blur are synonyms defined as:

Other synonyms of smudge include smear, smutch.

smudge (noun)	blur (noun)
a blemish made by dirt	a hazy or indistinct representation
a smoky fire to drive away insects

smudge (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