gaffe or (rare) gaff /gaf/

A blunder

• band-saws
• bandshell
• bandshells
• bandsman
• bandsmen
• bandstand
• bandstands
• bandster
• bandsters
• band-stone
• band-string
• band-strings
• bandura
• banduras
• bandwagon
• bandwagons
• band-wheel
• band-wheels
• bandwidth
• bandwidths
• bandy
• bandy-ball
• bandy-bandy
• bandying
• bandyings