FLIEST is a playable word

fly Scrabble® Dictionary

adjective
flier, fliest
clever
verb
flew, flown, flying, flies
to move through the air
verb
flied, flying, flies
to hit a ball high into the air in baseball
88 Playable Words can be made from "FLIEST"
   2-Letter Words (12 found)
   3-Letter Words (26 found)
   6-Letter Words (5 found)