sodium dichromate vs sodium bichromate

sodium dichromate and sodium bichromate both are nouns.

Word	Noun	Adjective	Verb	Adverb
sodium dichromate	Yes	No	No	No
sodium bichromate	Yes	No	No	No

As nouns, sodium dichromate and sodium bichromate are synonyms defined as:

sodium dichromate and sodium bichromate: a red-orange salt used as a mordant

sodium dichromate (noun)	sodium bichromate (noun)
a red-orange salt used as a mordant	a red-orange salt used as a mordant