civilization vs American spelling

civilization and American spelling both are nouns.

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

civilization (noun)	American spelling (noun)
the quality of excellence in thought and manners and taste	English orthography used in the United States (characterized by 'analyze', 'center', 'usable')
a society in an advanced state of social development (e.g., with complex legal and political and religious organizations)
a particular society at a particular time and place
the social process whereby societies achieve an advanced stage of development and organization