FIBRIL is a playable word

fibril Scrabble® Dictionary

noun
pl. fibrils
a small fiber
14 Playable Words can be made from "FIBRIL"
   2-Letter Words (3 found)
   3-Letter Words (6 found)
   4-Letter Words (3 found)
   5-Letter Words (1 found)
   6-Letter Words (1 found)