WHAMMO is a playable word

whammo Scrabble® Dictionary

interjection
— used to indicate a startling event
36 Playable Words can be made from "WHAMMO"
   2-Letter Words (13 found)
   3-Letter Words (16 found)
   4-Letter Words (5 found)
   5-Letter Words (1 found)
   6-Letter Words (1 found)