slur vs splotch

slur and splotch both are nouns.

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

As nouns, splotch is a hyponym of slur; that is, splotch is a word with a more specific, narrower meaning than slur:

Other hyponyms of slur include blotch, splodge, fingermark, fingerprint, inkblot.

slur (noun)	splotch (noun)
a blemish made by dirt	an irregularly shaped spot
a disparaging remark
(music) a curved line spanning notes that are to be played legato

slur (verb)	splotch (verb)
become vague or indistinct	blotch or spot
utter indistinctly
speak disparagingly of; e.g., make a racial slur
play smoothly or legato