smear vs splotch

smear and splotch both are nouns.

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

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

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

smear (noun)	splotch (noun)
an act that brings discredit to the person who does it	an irregularly shaped spot
a blemish made by dirt
a thin tissue or blood sample spread on a glass slide and stained for cytologic examination and diagnosis under a microscope
slanderous defamation

smear (verb)	splotch (verb)
charge falsely or with malicious intent; attack the good name and reputation of someone	blotch or spot
make a smudge on; soil by smudging
stain by smearing or daubing with a dirty substance
cover (a surface) by smearing (a substance) over it