knubble, nubble /nubˈl/ or knobble /nobˈl/

1. To beat with the fists
2. To knock

• frictions
• friction tape
• friction tapes
• friction welding
• Friday
• Friday afternoon car
• Friday car
• Fridays
• fridge
• fridged
• fridge-freezer
• fridge-freezers
• fridges
• fridging
• fried
• friedcake
• friedcakes
• Friedreich's ataxia
• friend
• friended
• friending
• friendings
• friendless
• friendlessness
• friendlessnesses