atomist theory vs atomic theory

atomist theory and atomic theory both are nouns.

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

As nouns, atomist theory and atomic theory are synonyms defined as:

atomist theory and atomic theory: (chemistry) any theory in which all matter is composed of tiny discrete finite indivisible indestructible particles

Other synonyms of atomist theory include atomism, atomistic theory.

atomist theory (noun)	atomic theory (noun)
(chemistry) any theory in which all matter is composed of tiny discrete finite indivisible indestructible particles	(chemistry) any theory in which all matter is composed of tiny discrete finite indivisible indestructible particles
	a theory of the structure of the atom