ding vs blemish

ding and blemish both are nouns.

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

As nouns, blemish is a hypernym of ding; that is, blemish is a word with a broader meaning than ding:

ding: an impression in a surface (as made by a blow)
blemish: a mark or flaw that spoils the appearance of something (especially on a person's body)

Other hypernyms of ding include defect, mar.

ding (noun)	blemish (noun)
an impression in a surface (as made by a blow)	a mark or flaw that spoils the appearance of something (especially on a person's body)
a ringing sound

ding (verb)	blemish (verb)
go `ding dong', like a bell	add a flaw or blemish to; make imperfect or defective
	mar or impair with a flaw
	mar or spoil the appearance of