The best replacement for addendum is addenda.

The best alternatives to addendum are rated as following:
★★★★★  addenda
★★★★★  appendix
★★★★★  amendment
★★★  bulletin
★★  attachment
★★  rider
★★  revision
★★  annex
★★  change order
★  supplement
★  corrigendum
★  exhibit
★  amendment real estate
★  counter offer
★  asi
  codicil
  annexure
  amendment definition
  erratum
  addendum
  amendment contract

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