American spelling vs discolorize

American spelling is a noun but discolorize is not a noun.

Word	Noun	Adjective	Verb	Adverb
American spelling	Yes	No	No	No
discolorize	No	No	Yes	No

American spelling (noun)	discolorize (noun)
English orthography used in the United States (characterized by 'analyze', 'center', 'usable')

American spelling (verb)	discolorize (verb)
	cause to become white or lighter in color