What's the functional difference between larynx and pharynx?

Big difference. Larynx is lower in the pharynx and contains the vocal cords..These close during swallowing and open for breathing.
Pharynx. The pharynx describes a region above and around your larynx that is made up of muscle and mucosal tissue and is involved in the coordination of swallowing.

Related Questions

Difference between larynx and pharynx?

Adjacent structures. The two are adjacent anatomical structures. In simple terms, the larynx is the voice box and the pharynx is the throat passage. Of course this is a simplified description. Read more...