club soda vs sparkling water

club soda and sparkling water both are nouns.

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

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

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

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

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