American spelling vs familiarization

American spelling and familiarization both are nouns.

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

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