washing soda vs soda

washing soda and soda both are nouns.

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

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

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

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

washing soda (noun)	soda (noun)
a sodium salt of carbonic acid; used in making soap powders and glass and paper	a sweet drink containing carbonated water and flavoring
	a sodium salt of carbonic acid; used in making soap powders and glass and paper