American spelling vs systematic desensitization

American spelling and systematic desensitization both are nouns.

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

American spelling (noun)	systematic desensitization (noun)
English orthography used in the United States (characterized by 'analyze', 'center', 'usable')	a technique used in behavior therapy to treat phobias and other behavior problems involving anxiety; client is exposed to the threatening situation under relaxed conditions until the anxiety reaction is extinguished