react vs chemical science

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

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

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

react (verb)	chemical science (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