The term 'Famous Fountain Drink' can be summarized as the Trevi Fountain, a 5-letter word. The Trevi Fountain is a famous fountain located in Rome, Italy. It is one of the most iconic fountains in the world and has been featured in many films and television shows. The fountain was designed by Italian architect Nicola Salvi in 1732 and is a popular tourist attraction. The fountain is also known for its legend that if you throw a coin into it, you will return to Rome.