smear vs smudge

smear and smudge both are nouns.

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

As nouns, smear and smudge are synonyms defined as:

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

As verbs, smear and smudge are synonyms defined as:

Other synonyms of smear include blur, smutch.

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

smear (verb)	smudge (verb)
charge falsely or with malicious intent; attack the good name and reputation of someone	make a smudge on; soil by smudging
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