soda water vs sparkling water

soda water and sparkling water both are nouns.

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

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

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

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

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