There are several synonyms for the word "ICEES" that can be used interchangeably to refer to a frozen carbonated beverage. One common synonym is "slushie", which denotes a drink with crushed ice and flavored syrup. Another popular term is "frosty", which highlights the frost-like texture of the icy treat. "Freezee" is also a synonym that perfectly captures the frosty sensation created by the chilled and carbonated drink. Lastly, "shaved ice" is another synonym that emphasizes the fine and shaved texture of the frozen beverage. Regardless of the synonym used, all these words describe the delicious, refreshing drink known as an ICEE.