When it comes to staying dry during rainy weather, a rain coat is a must-have item. However, there are several synonyms for the phrase rain coat that can be used interchangeably. Some of the common synonyms for rain coat include slicker, waterproof jacket, rain jacket, and anorak. Each of these terms refers to a waterproof garment that is designed to protect the wearer from rain and moisture. Regardless of the synonym used, the primary purpose of a rain coat remains the same: to keep the wearer dry and comfortable in wet weather.