decaffeinated coffee vs coffee

decaffeinated coffee and coffee both are nouns.

Word	Noun	Adjective	Verb	Adverb
decaffeinated coffee	Yes	No	No	No
coffee	Yes	No	No	No

As nouns, coffee is a hypernym of decaffeinated coffee; that is, coffee is a word with a broader meaning than decaffeinated coffee:

Other hypernyms of decaffeinated coffee include java.

decaffeinated coffee (noun)	coffee (noun)
coffee with the caffeine removed	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