chemistry vs atomic theory

chemistry and atomic theory both are nouns.

Word	Noun	Adjective	Verb	Adverb
chemistry	Yes	No	No	No
atomic theory	Yes	No	No	No

chemistry (noun)	atomic theory (noun)
the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions	(chemistry) any theory in which all matter is composed of tiny discrete finite indivisible indestructible particles
the way two individuals relate to each other	a theory of the structure of the atom
the chemical composition and properties of a substance or object