A treehouse is a classic childhood dream, but the word "treehouse" itself is quite limiting when it comes to describing these structures. Here are a few synonyms that capture the magic and whimsy of these elevated sanctuaries: 1. Treetop retreat: This phrase paints a picture of a cozy, secluded space nestled among the branches of a sturdy tree. 2. Elevated abode: A more formal term that suggests a treehouse that's a bit more refined and structurally sound. 3. Canopy cabin: The alliteration in this phrase makes it particularly pleasing to say, and it conjures images of a snug little hideaway perched high in the treetops. 4. Sky fort: This synonym emphasizes the adventurous, playful side of treehouses.