The best replacement for power off is shutdown.

The best alternatives to power off are rated as following:
★★★★★  shutdown
★★★  shutdown guest
★★  sleep mode
★★  standby ps4
★  hard reset
★  restart
  shut down vmware
  full power off

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Speaking about power off, one probably shouldn't forget about shutdown.

Other search terms related to power off and their ratings are:
★★★★★ shutdown
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Google Trends

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power off
shutdown
shutdown guest