reaction vs chemical science

reaction and chemical science both are nouns.

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

reaction (noun)	chemical science (noun)
a bodily process occurring due to the effect of some antecedent stimulus or agent	the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions
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