Treehouse (noun)

A small house or structure built in or among the branches of a tree.

Origin:

From the two words "tree" and "house".

Examples:

1. He built a treehouse in the oak tree in his backyard.
2. The children loved playing in the treehouse.
3. The treehouse was equipped with a rope ladder.
4. The treehouse was used as a fort by the kids.
5. The treehouse provided a great view of the surrounding area.