Are you sure they are spells that require verbal components? Those are the only spells that will be "silenced".

The official 5e description of the silence spell is this-

"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."

Last edited by JennaZoo; 12/10/20 01:20 AM. Reason: Addition