familiarization vs American spelling

familiarization and American spelling both are nouns.

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

familiarization (noun)	American spelling (noun)
the experience of becoming familiar with something	English orthography used in the United States (characterized by 'analyze', 'center', 'usable')