This is the 726th most frequent Chinese word.
房屋
House; building.
Here, '房屋' is used to refer to a specific construction meant for living.
这座房屋是我的祖父建的。
This house was built by my grandfather.
Here, '房屋' specifies the building structure that is being protected.
为了避免损坏房屋，我们需要修理屋顶。
To avoid damaging the house, we need to repair the roof.
In this context, '房屋' denotes various houses as a general category.