abetter

noun
  1. a person who encourages or assists someone to do something wrong, in particular to commit a crime.
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abler

adjective
  1. Easy to use.
  2. Suitable; competent.
  3. Liable to.
  4. Having the necessary powers or the needed resources
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abolisher

A person who abolishes.

abrasiometer

One of the many devices used to test abrasion of a coating.