desensitization vs American spelling

desensitization and American spelling both are nouns.

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

desensitization (noun)	American spelling (noun)
the process of reducing sensitivity	English orthography used in the United States (characterized by 'analyze', 'center', 'usable')