The Japanese noun '巣 (す)' means 'nest'. This word is used to describe the structure built by birds, insects, or other animals to lay eggs or raise their young. It can also be used metaphorically to describe a place where people gather or live, often with a negative connotation. For example: a bird's nest「鳥の巣」(とりのす). The criminal's hideout was like a nest「犯罪者の隠れ家は巣のようだった」(はんざいしゃのかくれがはすのようだった). The word can also be used in compound words, such as '蜘蛛の巣 (くものす)' (spider's web).