The term 'TANK PART' can be broken down into two crossword solutions: TREAD (5 letters) and BOGIE (5 letters). TREAD is the rubber track that wraps around the wheels of a tank, providing traction and allowing it to move over rough terrain. BOGIE is the wheeled suspension system that supports the weight of the tank and helps to absorb shock from uneven surfaces. Both components are essential for tanks to move effectively and efficiently.