What word is popular in American English?
Room in roof is called:
1) attic: the space or room at the top of a building, under the roof, often used for storing things.
2) loft: a space at the top of a building under the roof used for storing things and usually entered by a ladder, or sometimes made into a room for living in.
3) garret: a habitable attic, a living space at the top of a house or larger residential building, often small, dismal, and cramped, with sloping ceilings.
4) sky parlor: a room on the top floor of a house directly beneath the roof.
(Definitions are from Cambridge dictionary or lexico)
Thank you for your help 😊[Image]

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If you have money, you say "I have a loft apartment."

If you don't have money, you say "I live in the attic."

This is funny, but true.

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I’ve never heard of “sky parlor”.  I’ve heard my parents say “garret” (they’re 80 years old) but I rarely hear it.  Attic and loft are in common usage.

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An attic is a storage space, where only bugs, squirrels and maybe dead relatives would live. A loft is a living space, often open to the room below. Nobody in North America says "garret" or "sky parlour" unless they just got off the plane from somewhere else.

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Loft or an attic.

Attic is probably more common because loft also is a type of apartment.

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Thank you you guys for helping me. There are different answers so I'm a bit concern now 🤣 But it's all belong to where we come from, isn't it? 
Many thanks 😊