MERCER is a playable word

mercer Scrabble® Dictionary

noun
pl. mercers
a dealer in textiles
17 Playable Words can be made from "MERCER"
   2-Letter Words (4 found)
   3-Letter Words (7 found)
   4-Letter Words (3 found)
   5-Letter Words (2 found)
   6-Letter Words (1 found)