Refers to an opening in a wall, vehicle, or building for light and air; also used metaphorically for a view or access point.
窓を開けて空気を入れ替えましょう。
Let's open the window and let in some fresh air.
電車の窓から富士山が見えた。
I could see Mt. Fuji from the train window.
It was hot, so I opened the window.
It started raining, so I closed the window.
You can see the sea from the window.
I was looking out the window on the train.
I waved through the window.
窓 is the window opening itself, while 網戸 is the mesh screen fitted over it to keep insects out.
skylight · head (of a door/window)
window side; window seat
bay window
back window; rear window
circular window; round window
inner window; secondary window
floor-level window; low window
outer window
small window; fenestella; scuttle
small high lattice window
false window; blind window
window sill; window ledge
window frame; sash
windowpane oyster
Rarely used kanji form.