The term 'bendable body part' can be summarized by two crossword solutions: KNEE (4 letters) and ELBOW (5 letters). The KNEE is a joint in the human body that connects the thigh bone to the lower leg bones, and it is the largest joint in the body. It is also one of the most bendable joints, allowing for a wide range of motion. The ELBOW is another joint in the human body that connects the upper arm bone to the lower arm bones. It is also highly bendable, allowing for a wide range of motion, including flexion, extension, and rotation.