chemical science vs react

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

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

chemical science (noun)	react (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)	react (verb)
	undergo a chemical reaction; react with another substance under certain conditions
	show a response or a reaction to something
	act against or in opposition to