LUMINAL is a playable word

lumen Scrabble® Dictionary

noun
pl. lumens or lumina
the inner passage of a tubular organ
(adjective) lumenal, luminal
66 Playable Words can be made from "LUMINAL"
   2-Letter Words (14 found)
   3-Letter Words (19 found)
   5-Letter Words (5 found)
   6-Letter Words (4 found)
   7-Letter Words (1 found)