The best replacement for per diem is part time.

The best alternatives to per diem are rated as following:
★★★★★  part time
★★★★★  prn
★★★  actual expenses
★★  reimbursement
★★  subsistence
★★  full time
★★  demurrage
★★  drg
★  on call
★  expenses
★  per diem
★  detention
★  casual
★  fee for service
★  actuals
★  allowance
  actual expense
  stipend
  case rate
  hourly rate

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Speaking about per diem, one probably shouldn't forget about pcs.

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



Google Trends

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per diem
part time
prn