Poison sumac, Toxicodendron vernix, is related to the poison ivies and poison oaks, not to the other sumacs. It is relatively rare, compared to the other members of the family.
Definition of taproom in US English - a room in which alcoholic drinks, especially beer, are available on tap; a bar in a hotel or inn. Definition of taproom in US English - a room in which alcoholic drinks, especially beer, are available on tap; a bar in a hotel or inn.
A tavern is a pub that also rents rooms out. A saloon is a tavern in the American West. They would also often double as a brothel. A bar is the modern equivalent of a pub, but it is less of a social gathering and more of a place to get drunk and hook up with someone. A taproom, so far as I know, is the room in the back of a bar or pub that has the large kegs that supply beer.