The term 'SOURCE OF BILE' can be solved by the word 'LIVER', which is a five-letter word. The LIVER is an organ located in the upper right side of the abdomen and is responsible for many important functions in the body, including the production of bile. Bile is a digestive fluid that helps to break down fats and absorb certain vitamins and minerals. It is produced by the LIVER and stored in the gallbladder until it is needed.