fossilize vs American spelling

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

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

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

fossilize (verb)	American spelling (verb)
convert to a fossil
become mentally inflexible