atomic theory vs atomist theory

atomic theory and atomist theory both are nouns.

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

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

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

Other synonyms of atomic theory include atomism, atomistic theory.

atomic theory (noun)	atomist 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