The best replacement for den is living room.

The best alternatives to den are rated as following:
★★★★★  living room
★★★★  bedroom
★★★★  dia
★★★  family room
★★  der
★★  burrow
★★  study
★  lair
★  sea
★  det swedish
★  ne
  einen
  dem
  bal
  cave
  kc
  shark tank
  home office
  lal
  parlor
  spar
  guest room
  swiftech

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Speaking about den, one probably shouldn't forget about daniel.

Other search terms related to den and their ratings are:
★★★★★ daniel
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Google Trends

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den
living room
bedroom