Beer garden and Gin mill

Beer garden noun - Tavern with an outdoor area (usually resembling a garden) where beer and other alcoholic drinks are served.

Gin mill and beer garden are semantically related In some cases you can replace phrase "Gin mill" with "Beer garden", this phrases are similar.

Gin mill noun - A place of business where alcoholic beverages are sold to be consumed on the premises.

Beer garden and gin mill are semantically related in barroom topic. You can use "Beer garden" instead a noun phrase "Gin mill".