Liberian coffee vs coffee

Liberian coffee and coffee both are nouns.

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

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

Liberian coffee: small tree of West Africa
coffee: any of several small trees and shrubs native to the tropical Old World yielding coffee beans

Other hypernyms of Liberian coffee include coffee tree.

Liberian coffee (noun)	coffee (noun)
small tree of West Africa	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