HARDHAT is a playable word

hardhat Scrabble® Dictionary

noun
pl. hardhats
a conservative
33 Playable Words can be made from "HARDHAT"
   2-Letter Words (8 found)
   3-Letter Words (12 found)
   4-Letter Words (11 found)
   5-Letter Words (1 found)
   7-Letter Words (1 found)