FLATBOAT is a playable word

flatboat Scrabble® Dictionary

noun
pl. flatboats
a flat-bottomed boat
73 Playable Words can be made from "FLATBOAT"
   2-Letter Words (12 found)
   3-Letter Words (27 found)
   5-Letter Words (8 found)
   6-Letter Words (2 found)
   8-Letter Words (2 found)