coffee vs demitasse

coffee and demitasse both are nouns.

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

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

coffee (noun)	demitasse (noun)
a medium brown to dark-brown color	small coffee cup; for serving black coffee
a beverage consisting of an infusion of ground coffee beans	small cup of strong black coffee without milk or cream
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