巣【す】
nest, rookery, breeding place, hive, den, haunt, (spider's) web
古巣【ふるす】
old haunts, former homes
卵巣【らんそう】
ovary
空き巣【あきす】
empty nest, empty house, empty home, burglary (of an empty house), burglar (who targets empty houses), sneak thief, prowler
巣立ち【すだち】
leaving the nest, going out into the world, becoming independent