American spelling vs chemical defense

American spelling and chemical defense both are nouns.

Word	Noun	Adjective	Verb	Adverb
American spelling	Yes	No	No	No
chemical defense	Yes	No	No	No

American spelling (noun)	chemical defense (noun)
English orthography used in the United States (characterized by 'analyze', 'center', 'usable')	procedures involved in taking defensive measures against attacks using chemical agents