corkage vs service fee

corkage and service fee both are nouns.

Word	Noun	Adjective	Verb	Adverb
corkage	Yes	No	No	No
service fee	Yes	No	No	No

As nouns, service fee is a hypernym of corkage; that is, service fee is a word with a broader meaning than corkage:

corkage: a charge added at a restaurant for every bottle of wine served that was not bought on the premises
service fee: a percentage of a bill (as at a hotel or restaurant) added in payment for service

Other hypernyms of corkage include service charge.

corkage (noun)	service fee (noun)
a charge added at a restaurant for every bottle of wine served that was not bought on the premises	a percentage of a bill (as at a hotel or restaurant) added in payment for service