When Bugs Bunny outruns Elmer Fudd and vanishes down his rabbit hole, he’s escaping into a warren — a network of underground tunnels where rabbits live.
A warren isn’t just the maze-like tunnels where rabbits live. You may encounter a warren of subway tunnels or a warren of interconnected bomb shelters. Bring those narrow paths above ground and cluster them with homes and you have another kind of warren, or a maze-like residential area.
a colony of rabbits
a series of connected underground tunnels occupied by rabbits
a complex system of paths or tunnels in which it is easy to get lost
an overcrowded residential area