atomism vs atomistical

atomism is a noun but atomistical is not a noun.

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

atomism (noun)	atomistical (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

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