American spelling vs quantize

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

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

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

American spelling (verb)	quantize (verb)
	apply quantum theory to; restrict the number of possible values of (a quantity) or states of (a physical entity or system) so that certain variables can assume only certain discrete magnitudes that are integral multiples of a common factor
	approximate (a signal varying continuously in amplitude) by one whose amplitude is restricted to a prescribed set of discrete values