Words that end with “-able” and “-ible”

Words that end with -able and -ible are difficult to spell because they are pronounced the same way. Here are some general guidelines to help you decide which ending to use. But be careful: there are exceptions!

  1. If the corresponding noun ends in -ation (notation), add the suffix -able: notable
  2. If the corresponding noun ends in -sion or -tion (division), add the suffix -ible: divisible
  3. In most other cases, when the root word is a complete word (understand), add the suffix -able: understandable

  

Date modified: 2019-09-26

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