The term TEQUILA SOURCE can be solved by the five-letter word AGAVE. AGAVE is a genus of monocots native to the hot and arid regions of Mexico and the Southwestern United States. It is most commonly known for its use in the production of tequila, a distilled alcoholic beverage made from the blue AGAVE plant. AGAVE has been used for centuries in Mexico for its sweet sap, which is used to make syrup, and for its fibers, which are used to make rope and fabric.