For a place to drink:
* Pub
* Tavern
* Saloon
* Taproom
* Alehouse
* Nightclub
* Lounge
* Cocktail bar
For a barrier or obstruction:
* Obstacle
* Block
* Hindrance
* Impediment
* Restriction
For a solid piece of material:
* Rod
* Strip
* Beam
* Plank
* Railing
For a unit of pressure:
* Atmosphere (atm)
* Torr
* Pascal (Pa)
For a legal profession:
* Counsel
* Attorney
* Advocate
To give you the best synonym, please provide more context about what you are referring to.