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

To make voiceless

• grounder
• grounders
• ground-feeder
• ground-feeders
• ground floor
• ground floors
• ground frost
• ground game
• ground glass
• groundhog
• Groundhog Day
• groundhogs
• ground-hold
• groundhopper
• groundhoppers
• ground ice
• grounding
• groundings
• ground ivies
• ground ivy
• ground-ivy
• groundless
• groundlessly
• groundlessness
• groundlessnesses