react vs reaction

react is not a noun while reaction is a noun.

Word	Noun	Adjective	Verb	Adverb
react	No	No	Yes	No
reaction	Yes	No	No	No

react (noun)	reaction (noun)
	a bodily process occurring due to the effect of some antecedent stimulus or agent
	doing something in opposition to another way of doing it that you don't like
	an idea evoked by some experience
	extreme conservatism in political or social matters
	(mechanics) the equal and opposite force that is produced when any force is applied to a body
	a response that reveals a person's feelings or attitude
	(chemistry) a process in which one or more substances are changed into others

react (verb)	reaction (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