UPBUILDING is a playable word

upbuild Scrabble® Dictionary

verb
upbuilt, upbuilding, upbuilds
to build up
103 Playable Words can be made from "UPBUILDING"
   2-Letter Words (9 found)
   5-Letter Words (12 found)
   6-Letter Words (10 found)
   7-Letter Words (4 found)
   8-Letter Words (1 found)
   10-Letter Words (1 found)