soda ash vs sal soda

soda ash and sal soda both are nouns.

Word	Noun	Adjective	Verb	Adverb
soda ash	Yes	No	No	No
sal soda	Yes	No	No	No

As nouns, soda ash and sal soda are synonyms defined as:

soda ash and sal soda: a sodium salt of carbonic acid; used in making soap powders and glass and paper

Other synonyms of soda ash include soda, sodium carbonate, washing soda.

soda ash (noun)	sal soda (noun)
a sodium salt of carbonic acid; used in making soap powders and glass and paper	a sodium salt of carbonic acid; used in making soap powders and glass and paper