The Collaborative International Dictionary of English v.0.48:

Gospeler \Gos"pel*er\, n. [AS. godspellere.] [Written also
   gospeller.]
   1. One of the four evangelists. --Rom. of R.
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            Mark the gospeler was the ghostly son of Peter in
            baptism.                              --Wyclif.
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   2. A follower of Wyclif, the first English religious
      reformer; hence, a Puritan. [Obs.] --Latimer.
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            The persecution was carried on against the gospelers
            with much fierceness by those of the Roman
            persuasion.                           --Strype.
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   3. A priest or deacon who reads the gospel at the altar
      during the communion service.
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            The Archbishop of York was the celebrant, the
            epistoler being the dean, and the gospeler the
            Bishop of Sydney.                     --Pall Mall
                                                  Gazette.
      [1913 Webster]

WordNet (r) 3.0 (2006):

gospeler
    n 1: a preacher of the Christian gospel [syn: evangelist,
         revivalist, gospeler, gospeller]