gaffe or (rare) gaff /gaf/

A blunder

• flamers
• flames
• flames of the forest
• flame-thrower
• flame-throwers
• flame-tree
• flame-trees
• flame war
• flame wars
• flamfew
• flamfews
• flamier
• flamiest
• flamines
• flaming
• Flamingant
• flamingly
• flamingo
• flamingoes
• flamingos
• flaminical
• flamm
• flammabilities
• flammability
• flammable