Smoking room and Smoking compartment

Smoking room noun - Room in a hotel or club set apart for smokers.

Smoking compartment and smoking room are semantically related in compartment for smokers topic. In some cases you can use "Smoking compartment" instead a noun phrase "Smoking room".

Smoking compartment noun - A passenger car for passengers who wish to smoke.

Smoking room and smoking compartment are semantically related in compartment for smokers topic. You can use "Smoking room" instead a noun phrase "Smoking compartment".