saloon vs alehouse

saloon and alehouse both are nouns.

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

As nouns, alehouse is a hyponym of saloon; that is, alehouse is a word with a more specific, narrower meaning than saloon:

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

Other hyponyms of saloon include free house.

saloon (noun)	alehouse (noun)
a room or establishment where alcoholic drinks are served over a counter	a tavern where ale is sold
tavern consisting of a building with a bar and public rooms; often provides light meals
a car that is closed and that has front and rear seats and two or four doors