atomistic vs atomism

atomistic is not a noun while atomism is a noun.

Word	Noun	Adjective	Verb	Adverb
atomistic	No	Yes	No	No
atomism	Yes	No	No	No

atomistic (noun)	atomism (noun)
	(chemistry) any theory in which all matter is composed of tiny discrete finite indivisible indestructible particles
	(psychology) a theory that reduces all mental phenomena to simple elements (sensations and feelings) that form complex ideas by association

atomistic (adjective)	atomism (adjective)
divided into separate and often disparate elements