roof · shop

1. Origins, structure, and basic meaning

• Structure: 屋 relates to a house or roof; its kun-reading is や.
• Basic usage: 部屋(へや) means a room, while 屋根(やね) means a roof.

2. Common pitfalls and similar expressions

• An indoor room and a building's roof
  • 部屋の空気 means the air inside a room. 部屋 is the indoor space where a desk is placed or which is aired out.
  • 屋根の上 means on the roof. 屋 comes last in 部屋 and first in 屋根, but is read や in both words.