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

To make voiceless

• schoolroom
• schoolrooms
• school run
• school runs
• schools
• school ship
• school ships
• school-taught
• schoolteacher
• schoolteachers
• schoolteaching
• schoolteachings
• school term
• school terms
• schooltide
• schooltides
• schooltime
• schooltimes
• school-trained
• schoolward
• schoolwards
• schoolwork
• schoolworks
• school year
• school years