American spelling vs memorize

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

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

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

American spelling (verb)	memorize (verb)
	commit to memory; learn by heart