UMPTEEN is a playable word

umpteen Scrabble® Dictionary

adjective
indefinitely numerous
55 Playable Words can be made from "UMPTEEN"
   2-Letter Words (13 found)
   3-Letter Words (21 found)
   4-Letter Words (16 found)
   5-Letter Words (2 found)
   6-Letter Words (2 found)
   7-Letter Words (1 found)