MUMSIER is a playable word

mumsy Scrabble® Dictionary

adjective
mumsier, mumsiest
maternal
81 Playable Words can be made from "MUMSIER"
   2-Letter Words (12 found)
   3-Letter Words (27 found)
   5-Letter Words (10 found)
   6-Letter Words (4 found)
   7-Letter Words (3 found)