soda pop vs soda water

soda pop and soda water both are nouns.

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

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

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

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

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