a curtain (both literal, as in a window covering: “open the curtains to let in the light”, and figurative, as in a barrier: “the Iron Curtain”)

(Internet slang, dated) Windows (an operating system)

window / (regional, dialect, Etchū region) a deep gap in a mountain ridge (so called for the way the wind blows through, like a window)

window

Bamboo Curtain

a green wall (a wall covered by greenery)

緑のカーテン: a green wall (a wall covered by greenery)

shower curtain

iron curtain (a barrier that greatly hinders interaction or exchange)

餓鬼: (Buddhism) a starving ghost; a brat (pejorative term referring to a child) / 餓っ鬼: a brat (pejorative term referring to a child) / 月忌: monthly observance of the day of someone's death