damage vs blemish

damage and blemish both are nouns.

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

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

damage (noun)	blemish (noun)
the act of damaging something or someone	a mark or flaw that spoils the appearance of something (especially on a person's body)
any harm or injury resulting from a violation of a legal right
the occurrence of a change for the worse
loss of military equipment
the amount of money needed to purchase something

damage (verb)	blemish (verb)
inflict damage upon	add a flaw or blemish to; make imperfect or defective
suffer or be susceptible to damage	mar or impair with a flaw
	mar or spoil the appearance of