HELICOID is a playable word

helicoid Scrabble® Dictionary

noun
pl. helicoids
a type of geometrical surface
116 Playable Words can be made from "HELICOID"
   2-Letter Words (15 found)
   3-Letter Words (29 found)
   6-Letter Words (4 found)
   7-Letter Words (3 found)
   8-Letter Words (1 found)