natural philosophy vs quantise

natural philosophy is a noun but quantise is not a noun.

Word	Noun	Adjective	Verb	Adverb
natural philosophy	Yes	No	No	No
quantise	No	No	Yes	No

natural philosophy (noun)	quantise (noun)
the science of matter and energy and their interactions

natural philosophy (verb)	quantise (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