Silence is a 2nd-level Illusion spell for Bard, Cleric, Ranger. Casting time: 1 action. Range: 120 feet. Duration: Up to 10 minutes.
For the duration, no sound can be created within or pass through a 20-foot-radius sphere centered on a point you choose within range. Any creature or object entirely inside the sphere is immune to thunder damage, and creatures are deafened while entirely inside it.
Casting a spell that includes a verbal component is impossible there.