The best replacement for donation is contribution.

The best alternatives to donation are rated as following:
★★★★★  contribution
★★★★  sponsorship
★★  grant
★★  gift
★  adoption
★  fee
★  payment
★  sale
★  deed of sale
★  garage sale
★  fundraiser
★  charity
  sponsor
  pledge
  blood
  blood donation
  favors
  consignment
  organ donation
  plasma donation
  endowment
  . sponsorship
  tissue donation
  platelet donation
  whole blood
  cost basis

Your alternative for donation is not listed? Suggest!
Speaking about donation, one probably shouldn't forget about tax deduction.

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



Google Trends

Scale is based on the average worldwide traffic of donation in all years. Click on graph for more.
donation
contribution
sponsorship