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 😊