smudge vs splodge

smudge and splodge both are nouns.

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

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

Other hyponyms of smudge include blotch, splotch, fingermark, fingerprint, inkblot.

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

smudge (verb)	splodge (verb)
make a smudge on; soil by smudging