MASTIFFS is a playable word

mastiff Scrabble® Dictionary

noun
pl. mastiffs
a large, short-haired dog
87 Playable Words can be made from "MASTIFFS"
   2-Letter Words (13 found)
   3-Letter Words (26 found)
   6-Letter Words (4 found)
   7-Letter Words (1 found)
   8-Letter Words (1 found)