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

To make voiceless

• balloon catheter
• balloon catheters
• ballooned
• ballooning
• balloonings
• balloonist
• balloonists
• balloons
• balloon tyre
• balloon tyres
• balloon-vine
• balloon-vines
• balloon whisk
• balloon whisks
• ballot
• ballot box
• ballot boxes
• balloted
• ballotee
• ballotees
• balloting
• ballot paper
• ballot papers
• ballot-rigging
• ballots