sparkling water vs club soda

sparkling water and club soda both are nouns.

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

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

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

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

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