knubble, nubble /nubˈl/ or knobble /nobˈl/

1. To beat with the fists
2. To knock

• sillier
• sillies
• silliest
• sillily
• sillimanite
• sillimanites
• silliness
• sillinesses
• sillock
• sillocks
• sills
• silly
• silly-billies
• silly-billy
• silly-how
• silly-hows
• silly money
• silly season
• silly seasons
• Silly String®
• silo
• silo'd
• siloed
• siloing
• silos