A blunderbuss is an early type of FIREARM that was popular in the 17th and 18th centuries. It is characterized by its short, large caliber barrel and flared muzzle. The term 'blunderbuss' can also be used to describe someone who is clumsy or inept. The crossword solutions for the term blunderbuss are bumbler (7 letters), OAF (3 letters), GUN (3 letters), and FIREARM (7 letters). A bumbler is someone who is clumsy or inept, an OAF is a clumsy or stupid person, a GUN is a weapon that fires bullets, and a FIREARM is a weapon that uses gunpowder to fire a projectile.