devocalize or devocalise /dē-vōˈkə-līz/ or devoice /dē-voisˈ/

To make voiceless

• ballets
• ball-flower
• ball-flowers
• ball game
• ball games
• ball-girl
• ball-gown
• ball-gowns
• ballhawk
• ballhawks
• balling
• ballings
• ballista
• ballistae
• ballistas
• ballistic
• ballistic missile
• ballistic missiles
• ballistic pendulum
• ballistic pendulums
• ballistics
• ballistite
• ballistites
• ballistocardiogram
• ballistocardiograms