The best replacement for simultaneous is concurrent.

The best alternatives to simultaneous are rated as following:
★★★★★  concurrent
★★★  consecutive interpretation
★★★  sequential lineups
★★  contemporaneous
★  sequential
★  simultaneously
★  consecutive
★  selectable dual band
★  sequential lineup
  concurrently
  concomitant
  dual band concurrent

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Google Trends

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simultaneous
concurrent
consecutive interpretation