The answer to the crossword question “Relatively cool place is OASIS” is the word oasis. An oasis is typically a small area in a desert or other arid region that contains water, vegetation, and often shade. Due to the presence of water and vegetation, an oasis can be much cooler than the surrounding desert, making it a relatively cool place. Oases have historically been important refuges for travelers and nomads, as they provide vital resources in an otherwise harsh and inhospitable environment. Overall, the word oasis is a fitting answer to the crossword question, as it accurately describes a relatively cool and refreshing place amidst a hot and dry landscape.