UMBONAL is a playable word

umbo Scrabble® Dictionary

noun
pl. umbos or umbones
the rounded elevation at the center of a shield
(adjective) umbonal, umbonate, umbonic
69 Playable Words can be made from "UMBONAL"
   2-Letter Words (18 found)
   3-Letter Words (26 found)
   5-Letter Words (2 found)
   7-Letter Words (1 found)