People in the North are more likely to have a cooked meal called tea, and some (probably retired) still have their main meal at midday and call it dinner. We dont eat til 7.30, so call it dinner, though DH gets mixed up sometimes and says dinner when he means a lunchtime snack - no breeding, you see. Confused? My dad used to call his elevenses lunch.
Otherwise, lounge, sofa, cloth napkin for practicality if I am eating in front of the TV (I'm old, I can do what I like!)
loo or toilet, not rest room unless on a leeeeisurely tour with Americans, lol, because I dont go there to rest after all.
Orangery, not 'cos I am being posh but because it is technically different from a conservatory