different between actinism vs actinochemistry

English

actin- +? -ism

actinism (usually uncountable, plural actinisms)

(chemistry, physics) That property of electromagnetic radiation that leads to the production of photochemical effects

actino- +? chemistry

actinochemistry (uncountable)

The science of chemistry and actinism.
- 1872, John William Draper, "Researches in Actino-Chemistry […] " in Philosophical Magazine
  This view, which by a mass of evidence may be shown to be erroneous, is exerting a very prejudicial effect on the progress of actinochemistry.

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