chemical science vs atomistic theory

chemical science and atomistic theory both are nouns.

Word	Noun	Adjective	Verb	Adverb
chemical science	Yes	No	No	No
atomistic theory	Yes	No	No	No

chemical science (noun)	atomistic 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