American spelling vs encyclopedia

American spelling and encyclopedia both are nouns.

Word	Noun	Adjective	Verb	Adverb
American spelling	Yes	No	No	No
encyclopedia	Yes	No	No	No

American spelling (noun)	encyclopedia (noun)
English orthography used in the United States (characterized by 'analyze', 'center', 'usable')	a reference work (often in several volumes) containing articles on various topics (often arranged in alphabetical order) dealing with the entire range of human knowledge or with some particular specialty