gaffe or (rare) gaff /gaf/

A blunder

• deathsman
• deathsmen
• death-song
• death-songs
• death squad
• death squads
• death star
• death stars
• death-stroke
• death-strokes
• death throe
• death throes
• death-token
• death-tokens
• doubter
• doubters
• doubtful
• doubtfully
• doubtfulness
• doubtfulnesses
• doubtfuls
• doubting
• doubtingly
• doubtings
• doubting Thomas