natural philosophy vs crystallise

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

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

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

natural philosophy (verb)	crystallise (verb)
	cause to form crystals or assume crystalline form
	cause to take on a definite and clear shape
	make free from confusion or ambiguity; make clear