American spelling vs desensitizing

American spelling is a noun but desensitizing is not a noun.

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

American spelling (noun)	desensitizing (noun)
English orthography used in the United States (characterized by 'analyze', 'center', 'usable')

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