The best replacement for submission is submittal.

The best alternatives to submission are rated as following:
★★★★★  submittal
★★★  obedience
★★★  surrender
★★★  overawe
★★  submission
★★  subjection
★  technical submission
★  respect
★  seismic toss
★  submitting
★  vital throw
★  smtps
★  knockout
★  resubmission
★  dominance
★  subservience
  rebellion
  consent
  pin
  domination

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Speaking about submission, one probably shouldn't forget about submission.

Other search terms related to submission and their ratings are:
★★★★★ submission
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Google Trends

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submission
submittal
obedience