acclimatization vs American spelling

acclimatization and American spelling both are nouns.

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

acclimatization (noun)	American spelling (noun)
adaptation to a new climate (a new temperature or altitude or environment)	English orthography used in the United States (characterized by 'analyze', 'center', 'usable')