washing soda vs sodium carbonate

washing soda and sodium carbonate both are nouns.

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

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

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

Other synonyms of washing soda include sal soda, soda, soda ash.

washing soda (noun)	sodium carbonate (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