soda water vs soda

soda water and soda both are nouns.

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

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

soda water and soda: a sweet drink containing carbonated water and flavoring

Other synonyms of soda water include pop, soda pop, tonic.

soda water (noun)	soda (noun)
effervescent beverage artificially charged with carbon dioxide	a sweet drink containing carbonated water and flavoring
a sweet drink containing carbonated water and flavoring	a sodium salt of carbonic acid; used in making soap powders and glass and paper