knubble, nubble /nubˈl/ or knobble /nobˈl/

1. To beat with the fists
2. To knock

• guardianships
• guarding
• guardless
• guard of honour
• guardrail
• guardrails
• guard ring
• guard rings
• guardroom
• guardrooms
• guards
• guard-ship
• guardship
• guard-ships
• guardsman
• guardsmen
• guard's van
• guard's vans
• guardswoman
• guar gum
• guar gums
• guarish
• guarished
• guarishes
• guarishing