pasteurization vs American spelling

pasteurization and American spelling both are nouns.

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

pasteurization (noun)	American spelling (noun)
partial sterilization of foods at a temperature that destroys harmful microorganisms without major changes in the chemistry of the food	English orthography used in the United States (characterized by 'analyze', 'center', 'usable')