The term PHAROS is a crossword solution that can be broken down into two words: BEACON (6 letters) and LIGHTHOUSE (10 letters). A BEACON is a signal fire or light used to warn of danger or guide ships, while a LIGHTHOUSE is a tall structure with a powerful light that serves as a navigational aid for ships at sea. The term PHAROS specifically refers to the ancient LIGHTHOUSE of Alexandria, one of the Seven Wonders of the Ancient World.