club soda vs seltzer

club soda and seltzer both are nouns.

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

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

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

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

club soda (noun)	seltzer (noun)
effervescent beverage artificially charged with carbon dioxide	naturally effervescent mineral water
	effervescent beverage artificially charged with carbon dioxide