bleach vs discolor

bleach is a noun but discolor is not a noun.

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

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

bleach (noun)	discolor (noun)
the act of whitening something by bleaching it (exposing it to sunlight or using a chemical bleaching agent)
the whiteness that results from removing the color from something
an agent that makes things white or colorless

bleach (verb)	discolor (verb)
make whiter or lighter	change color, often in an undesired manner
cause to become white or lighter in color	lose color or turn colorless
	cause to lose or change color