soda water vs club soda

soda water and club soda both are nouns.

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

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

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

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

soda water (noun)	club soda (noun)
effervescent beverage artificially charged with carbon dioxide	effervescent beverage artificially charged with carbon dioxide
a sweet drink containing carbonated water and flavoring