The best replacement for able is ible.

The best alternatives to able are rated as following:
★★★★★  ible
★★★★  capable
★★  can
★★  ible suffix
★★  abel
★★  unable
★★  enable
★  ducommun
★  ible spelling rule
  able
  nadelman
  disable
  ible rule
  kaffeologie
  competent
  willing
  were you able
  i was able
  cain
  i were able
  could
  kaseya
  not do able
  been able

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Speaking about able, one probably shouldn't forget about suffixes.

Other search terms related to able and their ratings are:
★★★★★ suffixes
★★ affixes
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able
ible
capable