American spelling vs line of defense

American spelling and line of defense both are nouns.

Word	Noun	Adjective	Verb	Adverb
American spelling	Yes	No	No	No
line of defense	Yes	No	No	No

American spelling (noun)	line of defense (noun)
English orthography used in the United States (characterized by 'analyze', 'center', 'usable')	defensive structure consisting of a barrier that can be employed for defense against attack
	any organization whose responsibility it is to defend against something