blush vs discolor

blush is a noun but discolor is not a noun.

Word	Noun	Adjective	Verb	Adverb
blush	Yes	No	Yes	No
discolor	No	No	Yes	No

As verbs, discolor is a hypernym of blush; that is, discolor is a word with a broader meaning than blush:

Other hypernyms of blush include color, colour, discolour.

blush (noun)	discolor (noun)
sudden reddening of the face (as from embarrassment or guilt or shame or modesty)
makeup consisting of a pink or red powder applied to the cheeks
a rosy color (especially in the cheeks) taken as a sign of good health

blush (verb)	discolor (verb)
turn red, as if in embarrassment or shame	change color, often in an undesired manner
become rosy or reddish	lose color or turn colorless
	cause to lose or change color