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Webster 1913 Edition

Noun.

One who misuses.

“Wretched misusers of language.”

Coleridge.

(Law)

Unlawful use of a right; use in excess of, or varying from, one’s right.

Bouvier.

misuser ‎(plural misusers)

A person who misuses something.
- Coleridge
  Wretched misusers of language.
- 2009, February 28, “Alan Travis”, in Scheme to dock benefits of offenders defaulting on sentences is wound up^{[The Guardian]}:
  He said that lessons from the pilots would be carried forward into the plan to dock the benefits of drug misusers who failed to attend for job interviews.
(law) unlawful use of a right; use in excess of, or varying from, one's right
(Can we find and add a quotation of Bouvier to this entry?)