knubble, nubble /nubˈl/ or knobble /nobˈl/

1. To beat with the fists
2. To knock

• hard rubber
• hard rubbers
• hard-ruled
• hard-run
• hards
• hard sauce
• hard sauces
• hard science
• hardscrabble
• hard-sectored
• hard sell
• hard sells
• hard-set
• hardshell
• hardshell clam
• hardshell clams
• hardship
• hardships
• hard shoulder
• hard shoulders
• hard soap
• hard-standing
• hard-standings
• hard stocks
• hard stuff