pub vs tavern

pub and tavern both are nouns.

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

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

pub: tavern consisting of a building with a bar and public rooms; often provides light meals
tavern: a building with a bar that is licensed to sell alcoholic drinks

Other hypernyms of pub include tap house.

pub (noun)	tavern (noun)
tavern consisting of a building with a bar and public rooms; often provides light meals	a building with a bar that is licensed to sell alcoholic drinks