The best replacement for fixture is jig.

The best alternatives to fixture are rated as following:
★★★★★  jig
★★★  chattel
★★★  personal property
★★  equipment
★  trade fixture
★  fitting
★  ge led fixture
  luminaire
  led bulb
  fixture
  mock
  structure
  ballast
  appliance
  leasehold improvement
  light of america fixture

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

Other search terms related to fixture and their ratings are:
★★★★★ fan
★★★ ceiling fan
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Google Trends

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fixture
jig
chattel