BILLER is a playable word

biller Scrabble® Dictionary

noun
pl. billers
one that bills
35 Playable Words can be made from "BILLER"
   2-Letter Words (6 found)
   3-Letter Words (10 found)
   4-Letter Words (11 found)
   5-Letter Words (6 found)
   6-Letter Words (2 found)