rookery

noun4

1. •
   A colony of breeding birds or other animals.

   • It was a rookery which had never been raided by the hunters, and in consequence the seals were mild-tempered and at the same time unafraid. — 1904
2. •
   A crowded tenement.

   • Lord John Roxton and I turned down Vigo Street together and through the dingy portals of the famous aristocratic rookery. — 1912
3. •
   (UK, historical) A place where criminals congregate, often an area of a town or city.

   • The Flower and Dean St rookery had been home to many of those who lived at least partly by street crime. — 1980
4. •
   (slang, no longer used) That part of the barracks occupied by subalterns.