espresso vs coffee

espresso and coffee both are nouns.

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

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

espresso: strong black coffee brewed by forcing hot water under pressure through finely ground coffee beans
coffee: a beverage consisting of an infusion of ground coffee beans

Other hypernyms of espresso include java.

espresso (noun)	coffee (noun)
strong black coffee brewed by forcing hot water under pressure through finely ground coffee beans	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