different between foolability vs foolable

English

fool +? -ability

foolability (uncountable)

The quality of being foolable.
- 1933, H. G. Wells, The Shape of Things to Come
  Yet for such crucial purposes as bringing about a war or exploiting an economic situation, this was manifestly a quite disastrous degree of foolability.

fool +? -able

foolable (comparative more foolable, superlative most foolable)

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