chemistry vs chemical change

chemistry and chemical change both are nouns.

Word	Noun	Adjective	Verb	Adverb
chemistry	Yes	No	No	No
chemical change	Yes	No	No	No

chemistry (noun)	chemical change (noun)
the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions	(chemistry) any process determined by the atomic and molecular composition and structure of the substances involved
the way two individuals relate to each other
the chemical composition and properties of a substance or object