Phon-Voice,sound For the root "phon" P.S. Sorry if I got it wrong Saxophone-A single-reed woodwind with a conical bore. Phonics-Teaching reading by training beginners to associate letters with their sound values. Microphone-Device for converting sound waves into electrical energy. Euphonious-Having a pleasant sound. Cacophonous-Having an unpleasant sound. These are 5 words with root "phon" hope it works for you