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

To make voiceless

• sponges
• spongeware
• spongewares
• spongewood
• spongewoods
• spongicolous
• spongier
• spongiest
• spongiform
• spongily
• spongin
• sponginess
• sponginesses
• sponging
• sponging-house
• sponging-houses
• spongins
• spongiose
• spongious
• spongoid
• spongologies
• spongologist
• star map
• star maps
• starmonger