slur vs smudge

slur and smudge both are nouns.

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

As nouns, slur and smudge are synonyms defined as:

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

slur (noun)	smudge (noun)
a blemish made by dirt	a blemish made by dirt
a disparaging remark	a smoky fire to drive away insects
(music) a curved line spanning notes that are to be played legato

slur (verb)	smudge (verb)
become vague or indistinct	make a smudge on; soil by smudging
utter indistinctly
speak disparagingly of; e.g., make a racial slur
play smoothly or legato