circularization vs American spelling

circularization and American spelling both are nouns.

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

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