American spelling vs circularization

American spelling and circularization both are nouns.

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

American spelling (noun)	circularization (noun)
English orthography used in the United States (characterized by 'analyze', 'center', 'usable')	circulating printed notices as a means of advertising