keratinize vs American spelling

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

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

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

keratinize (verb)	American spelling (verb)
become horny and impregnated with keratin
convert into keratin