RUGAL is a playable word

ruga Scrabble® Dictionary

noun
pl. rugae
an anatomical fold or wrinkle
(adjective) rugal, rugate
18 Playable Words can be made from "RUGAL"
   2-Letter Words (4 found)
   3-Letter Words (8 found)
   4-Letter Words (4 found)
   5-Letter Words (2 found)