階上
か
い
じょ
う
Meanings
1
Refers to the floor above the current one, or the upstairs area in general. Antonym: 階下 (かいか, downstairs).
Antonyms: 階下
I can hear noises from the room upstairs.
2
top of the stairs
Specifically the landing or area at the top of a staircase. Antonym: 階下 (かいか, bottom of the stairs).
Antonyms: 階下 (かいか)
The cat is sleeping at the top of the stairs.