sodium carbonate vs washing soda

sodium carbonate and washing soda both are nouns.

Word	Noun	Adjective	Verb	Adverb
sodium carbonate	Yes	No	No	No
washing soda	Yes	No	No	No

As nouns, sodium carbonate and washing soda are synonyms defined as:

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

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

sodium carbonate (noun)	washing 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