deep brown vs coffee

deep brown and coffee both are nouns.

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

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

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

deep brown (noun)	coffee (noun)
a medium brown to dark-brown color	a medium brown to dark-brown color
	a beverage consisting of an infusion of ground coffee beans
	a seed of the coffee tree; ground to make coffee
	any of several small trees and shrubs native to the tropical Old World yielding coffee beans