different between redefinable vs redefinability

English

redefine +? -able

redefinable (not comparable)

That can be redefined.
- 1988, David Powell, Death Or Glory (video game review) in Your Sinclair (issue 25, January 1988)
  With a joystick (the keys are awkward and not redefinable) I found that forward is thrust, back is brake and the fire button, while nothing actually gets fired, needs to be pressed to destroy each piece of the mothership […]

redefinable +? -ity

redefinability (uncountable)

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