smudge vs smear

smudge and smear both are nouns.

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

As nouns, smudge and smear are synonyms defined as:

Other synonyms of smudge include blot, daub, slur, smirch, spot.

As verbs, smudge and smear are synonyms defined as:

Other synonyms of smudge include blur, smutch.

smudge (noun)	smear (noun)
a blemish made by dirt	an act that brings discredit to the person who does it
a smoky fire to drive away insects	a blemish made by dirt
	a thin tissue or blood sample spread on a glass slide and stained for cytologic examination and diagnosis under a microscope
	slanderous defamation

smudge (verb)	smear (verb)
make a smudge on; soil by smudging	charge falsely or with malicious intent; attack the good name and reputation of someone
	make a smudge on; soil by smudging
	stain by smearing or daubing with a dirty substance
	cover (a surface) by smearing (a substance) over it