different between accidentalism vs accidentalist

English

accidental +? -ism

accidentalism (uncountable)

Accidental character or effect.
The belief that outward appearance often contrasts with substance or essence (after Thomas Aquinas).
A system of medicine based on belief that symptoms of disease are caused by external factors.
The belief that events happen by random chance, without cause or purpose.

accidental +? -ist

accidentalist (plural accidentalists)

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