blemish vs smudge

blemish and smudge both are nouns.

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

As nouns, smudge is a hyponym of blemish; that is, smudge 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)
smudge: a blemish made by dirt

blemish (noun)	smudge (noun)
a mark or flaw that spoils the appearance of something (especially on a person's body)	a blemish made by dirt
	a smoky fire to drive away insects

blemish (verb)	smudge (verb)
add a flaw or blemish to; make imperfect or defective	make a smudge on; soil by smudging
mar or impair with a flaw
mar or spoil the appearance of