The term 'BIG GUN' can be described by the following crossword solutions: BERTHA (6 letters), CANNON (6 letters), VIP (3 letters), HONCHO (6 letters), Kahuna (6 letters), MORTAR (6 letters), HOWITZER (8 letters), and IMPORTANT (9 letters). BERTHA is a slang term for a powerful person, while CANNON is a large, heavy gun. VIP stands for very IMPORTANT person, and HONCHO is another slang term for a leader or boss. Kahuna is a Hawaiian term for a powerful person, and MORTAR is a type of artillery weapon. HOWITZER is another type of artillery weapon, and IMPORTANT is an adjective used to describe someone or something of great significance. All of these words can be used to describe someone or something that is powerful, influential, or IMPORTANT, which is the definition of the term 'BIG GUN'.