Tonic water, a fizzy beverage that's typically mixed with gin, has a distinct bitter and sweet taste. Some common synonyms for this carbonated drink include soda water, sparkling water, seltzer, and club soda. Although these terms are used interchangeably, they have their subtle differences. For instance, soda water is carbonated water with added sodium bicarbonate, while sparkling water indicates water with carbon dioxide that's naturally derived. Seltzer, too, features plain carbonated water without any additives. Lastly, club soda is carbonated water infused with minerals like sodium, potassium, and calcium. Regardless of the synonym you use, tonic water's quinine-infused taste is guaranteed to entice your taste buds.