coffee vs beverage

coffee and beverage both are nouns.

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

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

Other hypernyms of coffee include drink, drinkable, potable.

coffee (noun)	beverage (noun)
a medium brown to dark-brown color	any liquid suitable for drinking
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