American spelling vs staple fiber

American spelling and staple fiber both are nouns.

Word	Noun	Adjective	Verb	Adverb
American spelling	Yes	No	No	No
staple fiber	Yes	No	No	No

American spelling (noun)	staple fiber (noun)
English orthography used in the United States (characterized by 'analyze', 'center', 'usable')	a natural fiber (raw cotton, wool, hemp, flax) that can be twisted to form yarn