This is the 8198th most frequent Japanese word.
巣窟
Den, haunt, or refuge; a place where undesirable activities or individuals gather.
Here, '巣窟' is used metaphorically to describe a location that harbors individuals involved in criminal activities.
この場所は犯罪者の巣窟とされている。
This place is considered a den of criminals.
'巣窟' here suggests the dwellings or nests of animals, showcasing its literal meaning.
巣窟を見ると、自然界の生命力に感嘆する。
Seeing the lairs, I am amazed by the vitality of nature.
In this case, '巣窟' metaphorically refers to a place or group where conspiracies are concentrated or originate.