coffee vs mocha

coffee and mocha both are nouns.

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

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

coffee (noun)	mocha (noun)
a medium brown to dark-brown color	a dark brown color
a beverage consisting of an infusion of ground coffee beans	a superior dark coffee made from beans from Arabia
a seed of the coffee tree; ground to make coffee	a flavoring made from coffee mixed with chocolate
any of several small trees and shrubs native to the tropical Old World yielding coffee beans	soft suede glove leather from goatskin