gaffe or (rare) gaff /gaf/

A blunder

• SEM
• Sem.
• semanteme
• semantemes
• semantic
• semantically
• semantic error
• semantic errors
• rocker
• rocker arm
• rocker arms
• rockeries
• rocker panel
• rocker panels
• rockers
• rocker switch
• rocker switches
• rockery
• rocket
• rocketed
• rocketeer
• rocketeers
• rocket engine
• rocket engines
• rocketer