RECKONER is a playable word

reckoner Scrabble® Dictionary

noun
pl. reckoners
one that reckons
70 Playable Words can be made from "RECKONER"
   2-Letter Words (9 found)
   3-Letter Words (22 found)
   5-Letter Words (8 found)
   6-Letter Words (9 found)
   8-Letter Words (1 found)