RADIUS is a playable word

radius Scrabble® Dictionary

noun
pl. radiuses or radii
a straight line from the center of a circle to the circumference
verb
radiused, radiusing, radiuses
to give a rounded form to
51 Playable Words can be made from "RADIUS"
   2-Letter Words (9 found)
   3-Letter Words (19 found)
   4-Letter Words (18 found)
   5-Letter Words (4 found)
   6-Letter Words (1 found)