carbonated water vs club soda

carbonated water and club soda both are nouns.

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

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

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

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

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