rathskeller vs tavern

rathskeller and tavern both are nouns.

Word	Noun	Adjective	Verb	Adverb
rathskeller	Yes	No	No	No
tavern	Yes	No	No	No

As nouns, tavern is a hypernym of rathskeller; that is, tavern is a word with a broader meaning than rathskeller:

rathskeller: a tavern below street level featuring beer; originally a German restaurant in the basement of city hall
tavern: a building with a bar that is licensed to sell alcoholic drinks

Other hypernyms of rathskeller include tap house.

rathskeller (noun)	tavern (noun)
a tavern below street level featuring beer; originally a German restaurant in the basement of city hall	a building with a bar that is licensed to sell alcoholic drinks