The best replacement for tribe is clan.

The best alternatives to tribe are rated as following:
★★★★★  clan
★★★★  nation
★★★★  band
★★★  ethnic group
★★  language
★★  chiefdom
★  sabra
★  oracles
★  tribe
★  sabra hummus
★  butterworth
★  qubee
  wateen
  virtual villagers
  ethnicity
  pldt dsl
  adrenaline

Your alternative for tribe is not listed? Suggest!
Speaking about tribe, one probably shouldn't forget about bruce parry.

Other search terms related to tribe and their ratings are:
★★★★★ bruce parry
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tribe
clan
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