rathskeller vs tap house

rathskeller and tap house both are nouns.

Word	Noun	Adjective	Verb	Adverb
rathskeller	Yes	No	No	No
tap house	Yes	No	No	No

As nouns, tap house is a hypernym of rathskeller; that is, tap house 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
tap house: a building with a bar that is licensed to sell alcoholic drinks

Other hypernyms of rathskeller include tavern.

rathskeller (noun)	tap house (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