The best replacement for addenda is addendum.

The best alternatives to addenda are rated as following:
★★★★★  addendum
★  addendums
  avenant

Your alternative for addenda is not listed? Suggest!


No companions for addenda have been suggested so far.
You have in mind a companion for addenda and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of addenda in all years. Click on graph for more.
addenda
addendum
addendums