chemical science vs esterify

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

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

chemical science (noun)	esterify (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)	esterify (verb)
	change (a compound) into an ester