This is the 7396th most frequent Korean word.
천장
"천장" means "ceiling" in English.
'천장' here refers to the upper interior surface of the room.
이 방의 천장이 정말 높아요.
The ceiling of this room is really high.
'천장' in this sentence indicates the place where the light fixture is installed.
천장에 있는 전등을 교체해야겠어요.
I need to replace the light on the ceiling.
'천장' is used metaphorically to mean the highest achievable point or limit.