activity vs chemical science

activity and chemical science both are nouns.

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

activity (noun)	chemical science (noun)
any specific behavior	the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions
the trait of being active; moving or acting rapidly and energetically
an organic process that takes place in the body
a process existing in or produced by nature (rather than by the intent of human beings)
the state of being active
(chemistry) the capacity of a substance to take part in a chemical reaction