soda, pop or coke refer to any carbonated soft drink: Pepsi, Coca-Cola, Fanta, Sprite, 7up, Dr. Pepper, Mtn. Dew etc.
"Soda water" used in alcoholic drinks usually refers to a drink called Club Soda. Classic example would be Mojito
Other examples of carbonated alcoholic drinks (besides sparkling wines and beer)
Cuba Libre made with rum and Cola
Vodka tonic - explains itself