19. A non-transitory computer readable storage medium encoded with a computer program, the program comprising instructions that when executed by data processing apparatus cause the data processing apparatus to perform operations comprising: receiving, by an automated speech recognition system that (i) is configured to automatically perform an action in response to receiving a voice command that includes a particular term, and (ii) includes an automated speech recognizer and a text-to-speech generator, audio data corresponding to a user speaking the voice command using a restricted, canonical pronunciation for the particular term; and generating and providing, for output by the automated speech recognition system, (i) a transcription of the particular term that is generated by the automated speech recognizer, and (ii) an audible alert, generated by the text-to-speech generator, indicating that the user has spoken the particular term using the restricted, canonical pronunciation for the particular term, without initiating the action that is associated with the voice command.
19. A non-transitory computer readable storage medium encoded with a computer program, the program comprising instructions that when executed by data processing apparatus cause the data processing apparatus to perform operations comprising: receiving, by an automated speech recognition system that (i) is configured to automatically perform an action in response to receiving a voice command that includes a particular term, and (ii) includes an automated speech recognizer and a text-to-speech generator, audio data corresponding to a user speaking the voice command using a restricted, canonical pronunciation for the particular term; and generating and providing, for output by the automated speech recognition system, (i) a transcription of the particular term that is generated by the automated speech recognizer, and (ii) an audible alert, generated by the text-to-speech generator, indicating that the user has spoken the particular term using the restricted, canonical pronunciation for the particular term, without initiating the action that is associated with the voice command. 20. The computer readable storage medium of claim 19 , wherein the operations further comprise selecting, from among a plurality of canonical pronunciations stored in an age-restricted dictionary, the restricted, canonical pronunciation as a best match of a phonetic representation generated of the particular term.