Backwoods and Outer

Backwoods noun - A rural region that forms the edge of the settled or developed part of a country.

Outer and backwoods are semantically related. In some cases you can use "Outer" instead an adjective "Backwoods".

Outer adjective - Situated on the outside or farther out.

Backwoods and outer are semantically related. Sometimes you can use "Backwoods" instead an adjective "Outer".