営巣[eisou] building a nest
炎症病巣[enshoubyousou] inflamed part
燕巣[ensou] swift's nest (used to make bird's nest soup)
帰巣性[kisousei] homing instinct
空巣狙い[akisunerai] prowler

古巣[furusu] old haunts
精巣[seisou] testicle
青懸巣[aokakesu] blue jay (Cyanocitta cristata)
鼠巣[sosou] rat's nest

栖息[seisoku] inhabiting
隠栖[insei] secluded life
旧栖[kyuusei] old home
幽栖[yuusei] living a quiet life in seclusion away from the masses

栖む[sumu] to live (of animals)
羊栖菜[hijiki] hijiki (dark edible seaweed usu. sold in dried black strips; Hizikia fusiformis)
終の栖[tsuinosumika] one's final abode