natural philosophy vs liquefy

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

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

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

natural philosophy (verb)	liquefy (verb)
	become liquid or fluid when heated
	make (a solid substance) liquid, as by heating
	become liquid