discolorize vs American spelling

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

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

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

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