IMPROVER is a playable word

improver Scrabble® Dictionary

noun
pl. improvers
one that improves
95 Playable Words can be made from "IMPROVER"
   2-Letter Words (14 found)
   3-Letter Words (26 found)
   6-Letter Words (6 found)
   7-Letter Words (2 found)
   8-Letter Words (1 found)