club soda vs carbonated water

club soda and carbonated water both are nouns.

Word	Noun	Adjective	Verb	Adverb
club soda	Yes	No	No	No
carbonated water	Yes	No	No	No

As nouns, club soda and carbonated water are synonyms defined as:

club soda and carbonated water: effervescent beverage artificially charged with carbon dioxide

Other synonyms of club soda include seltzer, soda water, sparkling water.

club soda (noun)	carbonated water (noun)
effervescent beverage artificially charged with carbon dioxide	effervescent beverage artificially charged with carbon dioxide