LUMENAL is a playable word

lumen Scrabble® Dictionary

noun
pl. lumens or lumina
the inner passage of a tubular organ
(adjective) lumenal, luminal
71 Playable Words can be made from "LUMENAL"
   2-Letter Words (16 found)
   3-Letter Words (20 found)
   5-Letter Words (5 found)
   6-Letter Words (1 found)
   7-Letter Words (1 found)