PROOFING is a playable word

proof Scrabble® Dictionary

verb
proofed, proofing, proofs
to examine for errors
97 Playable Words can be made from "PROOFING"
   2-Letter Words (12 found)
   3-Letter Words (31 found)
   6-Letter Words (3 found)
   7-Letter Words (1 found)
   8-Letter Words (1 found)