sodium bichromate vs sodium dichromate

sodium bichromate and sodium dichromate both are nouns.

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

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

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

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