UNKNOWN is a playable word

unknown Scrabble® Dictionary

noun
pl. unknowns
one that is not known

18 Playable Words can be made from "UNKNOWN"

   2-Letter Words (7 found)

   3-Letter Words (5 found)

   4-Letter Words (3 found)

   5-Letter Words (2 found)

   7-Letter Words (1 found)