alehouse vs pub

alehouse and pub both are nouns.

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

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

alehouse: a tavern where ale is sold
pub: tavern consisting of a building with a bar and public rooms; often provides light meals

Other hypernyms of alehouse include gin mill, pothouse, public house, saloon, taphouse.

alehouse (noun)	pub (noun)
a tavern where ale is sold	tavern consisting of a building with a bar and public rooms; often provides light meals