blemish vs blot

blemish and blot both are nouns.

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

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

blemish: a mark or flaw that spoils the appearance of something (especially on a person's body)
blot: a blemish made by dirt

blemish (noun)	blot (noun)
a mark or flaw that spoils the appearance of something (especially on a person's body)	an act that brings discredit to the person who does it
	a blemish made by dirt

blemish (verb)	blot (verb)
add a flaw or blemish to; make imperfect or defective	dry (ink) with blotting paper
mar or impair with a flaw	make a spot or mark onto
mar or spoil the appearance of