Verified Answer :

WolfieWings

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