coffee vs coffee bean

coffee and coffee bean both are nouns.

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

As nouns, coffee and coffee bean are synonyms defined as:

coffee and coffee bean: a seed of the coffee tree; ground to make coffee

Other synonyms of coffee include coffee berry.

coffee (noun)	coffee bean (noun)
a medium brown to dark-brown color	a seed of the coffee tree; ground to make coffee
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