Four words have been given, out of which three are alike in some manner and one is different. Select the odd out one.

Barrack

Den - a wild animal's lair or habitation

Burrow - a hole or tunnel dug by a small animal, especially a rabbit, as a dwelling

Stable - a building set apart and adapted for keeping horses

Barrack- a building or group of building in which soldiers live

Except barrack ,all others are the homes of  different animals