Here are some examples:
* Telephone: A device for transmitting sound over a distance.
* Microphone: A device that converts sound waves into electrical signals.
* Homophone: A word that sounds the same as another word but has a different meaning.
* Symphonic: Relating to a symphony, a musical composition for a large orchestra.
So, when you see the suffix "-phone", it's a good indicator that the word relates to sound or voice in some way.