BW defense vs American spelling

BW defense and American spelling both are nouns.

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

BW defense (noun)	American spelling (noun)
defense against biological warfare	English orthography used in the United States (characterized by 'analyze', 'center', 'usable')