burnt umber vs chocolate

burnt umber and chocolate both are nouns.

Word	Noun	Adjective	Verb	Adverb
burnt umber	Yes	No	No	No
chocolate	Yes	No	No	No

As nouns, burnt umber and chocolate are synonyms defined as:

Other synonyms of burnt umber include coffee, deep brown, umber.

burnt umber (noun)	chocolate (noun)
a medium brown to dark-brown color	a medium brown to dark-brown color
dark brown pigment obtained by heating umber	a food made from roasted ground cacao beans
	a beverage made from cocoa powder and milk and sugar; usually drunk hot