How do arthritis and tendonitis differ?

Joint vs. tendon: Arthritis implies inflammation or damage in a joint. Tendinitis indicates inflammation of a tendon, where a muscle attaches to the bone.

Joint vs tendon: "itis" means inflammation. Arthritis is a condition of the joint, while tendinitis is an inflammation of the tendon. A tendon is the connection between a muscle and a bone. A joint is the connection between two bones (with cartilage for padding.).