initialization vs American spelling

initialization and American spelling both are nouns.

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

initialization (noun)	American spelling (noun)
(computer science) the format of sectors on the surface of a hard disk drive so that the operating system can access them and setting a starting position	English orthography used in the United States (characterized by 'analyze', 'center', 'usable')