American spelling vs fossilization

American spelling and fossilization both are nouns.

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

American spelling (noun)	fossilization (noun)
English orthography used in the United States (characterized by 'analyze', 'center', 'usable')	becoming inflexible or out of date
	the process of fossilizing a plant or animal that existed in some earlier age; the process of being turned to stone