The best replacement for planet is star.

The best alternatives to planet are rated as following:
★★★★★  star
★★★  moon
★★  dwarf planet
★  rough guide
★  gears of war
  captain pollution
  planet
  asteroid
  tempest
  planetoid
  gandalf
  comet
  outer planet
  star next to moon

Your alternative for planet is not listed? Suggest!
Speaking about planet, one probably shouldn't forget about moon.

Other search terms related to planet and their ratings are:
★★★★★ moon
You have in mind a companion for planet and it is not yet here? Propose!



Google Trends

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planet
star
moon