blotch vs blot

blotch and blot both are nouns.

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

As nouns, blot is a hypernym of blotch; that is, blot is a word with a broader meaning than blotch:

Other hypernyms of blotch include daub, slur, smear, smirch, smudge, spot.

blotch (noun)	blot (noun)
an irregularly shaped spot	an act that brings discredit to the person who does it
	a blemish made by dirt

blotch (verb)	blot (verb)
mark with spots or blotches of different color or shades of color as if stained	dry (ink) with blotting paper
	make a spot or mark onto