big gun (n.)

• baron
• bigwig
• brass
• celebrity
• chief
• dignitary
• dignity
• elder
• father
• figure
• high-muck-a-muck
• interests
• leader
• lion
• magnate
• mogul
• nabob
• name
• notability
• notable
• panjandrum
• personage
• personality
• power
• sachem
• somebody
• something
• tycoon
• worthy