chemical science vs purify

chemical science is a noun but purify is not a noun.

Word	Noun	Adjective	Verb	Adverb
chemical science	Yes	No	No	No
purify	No	No	Yes	No

chemical science (noun)	purify (noun)
the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions

chemical science (verb)	purify (verb)
	remove impurities from, increase the concentration of, and separate through the process of distillation
	make pure or free from sin or guilt
	become clean or pure or free of guilt and sin