A treetop dwelling is a type of home that is built in the branches of a tree. The two most common terms for this type of dwelling are 'NEST' and 'AERIE', both of which have four and five letters respectively. A NEST is typically a structure made of sticks, twigs, and other materials found in nature, while an AERIE is a more permanent structure, often made of wood or stone. Both types of treetop dwellings provide a unique living experience, offering a view of the surrounding landscape and a connection to nature.