The term MUSCLE CORD is composed of two words: SINEW (5 letters) and TENDON (6 letters). SINEW is a type of tough, fibrous tissue that connects muscle to bone. It is also known as a cord or ligament. TENDON is a type of connective tissue that attaches muscle to bone. It is made up of collagen fibers and is very strong and flexible. Together, SINEW and TENDON form the muscle cord, which is responsible for transmitting force from the muscle to the bone.