gaffe or (rare) gaff /gaf/

A blunder

• psammophiles
• psammophilous
• psammophils
• psammophyte
• psammophytes
• psammophytic
• p's and q's
• PSBR
• psc
• pschent
• pschents
• PSDR
• psellism
• psellisms
• psellismus
• psephism
• psephisms
• psephite
• psephites
• psephitic
• psephoanalysis
• psephological
• psephologies
• psephologist
• psephologists