different between diplomatist vs diplomatism

English

diplomatist (plural diplomatists)

a diplomat
- 1827, James Fenimore Cooper, The Prairie
  It was not so easy to penetrate the motives of the Pawnees. Calm, dignified, and yet far from repulsive, they set an example of courtesy, blended with reserve, that many a diplomatist of the most polished court might have strove in vain to imitate.

diplomat +? -ism

diplomatism (uncountable)

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