pronouncer

noun

1. One who pronounces.

   “Moreover, it is to be remembered that a poor speller is a poor pronouncer. The ear does not mark the sound any more exactly than the eye marks the letters.”

2. The official who gives out words to be spelled at a spelling bee and answers questions about their definition, use in a sentence and etymology.
3. A phonetic representation of the pronunciation of a word, to aid the presenter.

   “Pronouncers are shown in all wire service copy destined for broadcast use. If you are doubtful about a word and don't have a pronouncer, try looking them up on one of the many helpful pronunciation guides available online […]”