blur vs smudge

blur and smudge both are nouns.

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

As verbs, blur and smudge are synonyms defined as:

Other synonyms of blur include smear, smutch.

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

blur (verb)	smudge (verb)
become vague or indistinct	make a smudge on; soil by smudging
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