ADDENDA is a playable word

addendum Scrabble® Dictionary

noun
pl. addendums or addenda
something added or to be added
26 Playable Words can be made from "ADDENDA"
   2-Letter Words (10 found)
   3-Letter Words (9 found)
   4-Letter Words (4 found)
   5-Letter Words (1 found)
   6-Letter Words (1 found)
   7-Letter Words (1 found)