American spelling vs desensitization

American spelling and desensitization both are nouns.

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

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