10. A system comprising: one or more computers and one or more storage devices storing instructions that are operable, when executed by the one or more computers, to cause the one or more computers 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.
15. The system of claim 10 , wherein the operations further comprise: detecting, by the automated speech recognition system, a presence of another user when the another user is within a pre-determined distance of the user; determining, based on a comparison of (i) data that indicates an age of the user and (ii) an indication of age-appropriateness associated with the restricted, canonical pronunciation of the particular term, that the restricted, canonical pronunciation of the particular term by the user is not age appropriate; and based on determining that the restricted, canonical pronunciation of the particular term by the user is not age appropriate, transmitting the audible alert to the another user indicating that the restricted, canonical pronunciation is not age-appropriate.