soda vs soda pop

soda and soda pop both are nouns.

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

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

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

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

soda (noun)	soda pop (noun)
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