slur vs blot

slur and blot both are nouns.

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

As nouns, slur and blot are synonyms defined as:

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

slur (noun)	blot (noun)
a blemish made by dirt	an act that brings discredit to the person who does it
a disparaging remark	a blemish made by dirt
(music) a curved line spanning notes that are to be played legato

slur (verb)	blot (verb)
become vague or indistinct	dry (ink) with blotting paper
utter indistinctly	make a spot or mark onto
speak disparagingly of; e.g., make a racial slur
play smoothly or legato