dye vs discolor

dye is a noun but discolor is not a noun.

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

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

Other hypernyms of dye include color, colour, discolour.

dye (noun)	discolor (noun)
a usually soluble substance for staining or coloring e.g. fabrics or hair

dye (verb)	discolor (verb)
color with dye	change color, often in an undesired manner
color for microscopic study	lose color or turn colorless
	cause to lose or change color