sensitizing vs American spelling

sensitizing and American spelling both are nouns.

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

sensitizing (noun)	American spelling (noun)
rendering an organism sensitive to a serum by a series of injections	English orthography used in the United States (characterized by 'analyze', 'center', 'usable')

sensitizing (adjective)	American spelling (adjective)
making susceptible or sensitive to either physical or emotional stimuli