tan vs discolor

tan is a noun but discolor is not a noun.

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

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

Other hypernyms of tan include color, colour, discolour.

tan (noun)	discolor (noun)
a light brown the color of topaz
ratio of the opposite to the adjacent side of a right-angled triangle
a browning of the skin resulting from exposure to the rays of the sun

tan (adjective)	discolor (adjective)
of a light yellowish-brown color

tan (verb)	discolor (verb)
get a tan, from wind or sun	change color, often in an undesired manner
treat skins and hides with tannic acid so as to convert them into leather	lose color or turn colorless
	cause to lose or change color