KNOWINGEST is a playable word

knowing Scrabble® Dictionary

adjective
knowinger, knowingest
astute
noun
pl. knowings
knowledge
405 Playable Words can be made from "KNOWINGEST"
   2-Letter Words (25 found)
   3-Letter Words (77 found)
   8-Letter Words (5 found)
   10-Letter Words (1 found)