CMU Pronouncing Dictionary

This annotator tags words with their pronunciations according to the CMU Pronouncing dictionary, a machine-readable pronunciation dictionary for North American English that contains over 125,000 words and their transcriptions.

The following is from the CMUdict README

  CMUdict
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  CMUdict (the Carnegie Mellon Pronouncing Dictionary) is a free
  pronouncing dictionary of English, suitable for uses in speech
  technology and is maintained by the Speech Group in the School of
  Computer Science at Carnegie Mellon University.

  The Carnegie Mellon Speech Group does not guarantee the accuracy of
  this dictionary, nor its suitability for any specific purpose. In
  fact, we expect a number of errors, omissions and inconsistencies to
  remain in the dictionary. We intend to continually update the
  dictionary by correction existing entries and by adding new ones. From
  time to time a new major version will be released.

  We welcome input from users: Please send email to Alex Rudnicky
  (air+cmudict@cs.cmu.edu).

  The Carnegie Mellon Pronouncing Dictionary, in its current and
  previous versions is Copyright (C) 1993-2008 by Carnegie Mellon
  University.  Use of this dictionary for any research or commercial
  purpose is completely unrestricted.  If you make use of or
  redistribute this material we request that you acknowledge its
  origin in your descriptions.

  If you add words to or correct words in your version of this
  dictionary, we would appreciate it if you could send these additions
  and corrections to us (air+cmudict@cs.cmu.edu) for consideration in a
  subsequent version. All submissions will be reviewed and approved by
  the current maintainer, Alex Rudnicky at Carnegie Mellon.

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  The current version of cmudict is cmudict.0.7a 
  [First released October 29, 2007]