quantise vs quantisation

quantise is not a noun while quantisation is a noun.

Word	Noun	Adjective	Verb	Adverb
quantise	No	No	Yes	No
quantisation	Yes	No	No	No

quantise (noun)	quantisation (noun)
	the act of dividing into quanta or expressing in terms of quantum theory

quantise (verb)	quantisation (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