Big brass is a term used to describe a group of large, loud, and powerful brass instruments. Oomph (6 letters) is a low-pitched brass instrument that is similar to a TUBA. Tubas (5 letters) are the largest and lowest-pitched brass instruments. TUBA (4 letters) is a large, low-pitched brass instrument. TROMBONE (8 letters) is a long, slide-shaped brass instrument. Generals (8 letters) is a term used to describe high-ranking military officers. Pentagon (8 letters) is a five-sided building in Washington D.C. that houses the United States Department of Defense. Sabut (5 letters) is a type of TROMBONE with a wider bore than a regular TROMBONE.