Leatrix Silence allows you to silence various sounds in World of Warcraft, such as:

• Silence the combat vocal sounds added in Legion (such as this and this).
• Silence traditional combat racial sounds.
• Silence various interface sounds (such as chat buttons, game menu, etc).
• Silence various NPC sounds (such as Headless Horseman, Rhonin, etc).
• Silence various spell sounds (such as the spell cast fizzle sound, etc).