The Collaborative International Dictionary of English v.0.48:

Copyist \Cop"y*ist\, n.
   A copier; a transcriber; an imitator; a plagiarist.
   [1913 Webster]

WordNet (r) 3.0 (2006):

copyist
    n 1: someone employed to make written copies of documents and
         manuscripts [syn: copyist, scribe, scrivener]

Moby Thesaurus II by Grady Ward, 1.0:

62 Moby Thesaurus words for "copyist":
   amanuensis, ape, artisan, artist, artiste, calligrapher,
   chirographer, clerk, conformist, copier, copycat, counterfeiter,
   craftsman, creator, cuckoo, dauber, daubster, dissembler,
   dissimulator, echo, echoer, echoist, faker, forger, hypocrite,
   imitator, impersonator, impostor, ink spiller, inkslinger,
   letterer, maker, master, mime, mimer, mimic, mimicker, mocker,
   mockingbird, monkey, old master, parrot, pen, pencil driver,
   penman, penner, phony, plagiarist, poll-parrot, polly,
   polly-parrot, poseur, recording secretary, scribbler, scribe,
   scrivener, secretary, sheep, simulator, transcriber, word-slinger,
   writer