splotch vs smudge

splotch and smudge both are nouns.

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

As nouns, smudge is a hypernym of splotch; that is, smudge is a word with a broader meaning than splotch:

Other hypernyms of splotch include blot, daub, slur, smear, smirch, spot.

splotch (noun)	smudge (noun)
an irregularly shaped spot	a blemish made by dirt
	a smoky fire to drive away insects

splotch (verb)	smudge (verb)
blotch or spot	make a smudge on; soil by smudging