coffee vs deep brown

coffee and deep brown both are nouns.

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

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

Other synonyms of coffee include burnt umber, chocolate, umber.

coffee (noun)	deep brown (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