RUBY is a playable word

ruby Scrabble® Dictionary

adjective
rubier, rubiest
of a deep-red color
verb
rubied, rubying, rubies
to tint with the color of a ruby (a deep-red precious stone)
8 Playable Words can be made from "RUBY"
   2-Letter Words (1 found)
   3-Letter Words (5 found)
   4-Letter Words (2 found)