deep brown vs chocolate

deep brown and chocolate both are nouns.

Word	Noun	Adjective	Verb	Adverb
deep brown	Yes	No	No	No
chocolate	Yes	No	No	No

As nouns, deep brown and chocolate are synonyms defined as:

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

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