coffee vs mocha coffee

coffee and mocha coffee both are nouns.

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

As nouns, mocha coffee is a hyponym of coffee; that is, mocha coffee is a word with a more specific, narrower meaning than coffee:

coffee (noun)	mocha coffee (noun)
a medium brown to dark-brown color	a superior dark coffee made from beans from Arabia
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