gaffe or (rare) gaff /gaf/

A blunder

• clock-watcher
• clock-watching
• clockwise
• clockwork
• clockworks
• clod
• clodded
• cloddier
• cloddiest
• clodding
• cloddish
• cloddishly
• cloddishness
• cloddishnesses
• cloddy
• clodhopper
• clodhoppers
• clodhopping
• clodly
• clodpate
• clodpated
• clodpates
• clodpole
• clodpoles
• clodpoll