American spelling vs categorize

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

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

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

American spelling (verb)	categorize (verb)
	place into or assign to a category