FLATCAPS is a playable word

flatcap Scrabble® Dictionary

noun
pl. flatcaps
a type of hat
110 Playable Words can be made from "FLATCAPS"
   2-Letter Words (8 found)
   3-Letter Words (32 found)
   6-Letter Words (2 found)
   7-Letter Words (1 found)
   8-Letter Words (1 found)