RUGAE is a playable word

ruga Scrabble® Dictionary

noun
pl. rugae
an anatomical fold or wrinkle
(adjective) rugal, rugate
31 Playable Words can be made from "RUGAE"
   2-Letter Words (5 found)
   3-Letter Words (12 found)
   4-Letter Words (11 found)
   5-Letter Words (3 found)