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

To make voiceless

• oncome
• oncomes
• oncometer
• oncometers
• oncomice
• oncoming
• oncomings
• on commando
• OncoMouse®
• Oncorhynchus
• oncornavirus
• oncornaviruses
• oncost
• oncostman
• oncostmen
• oncosts
• oncotomies
• oncotomy
• on course
• on cue
• oncus
• OND
• ondansetron
• ondatra
• ondatras