chemical science vs denitrify

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

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

chemical science (noun)	denitrify (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)	denitrify (verb)
	remove nitrogen from