COPPER is a playable word

copper Scrabble® Dictionary

verb
coppered, coppering, coppers
to cover with copper (a metallic element)
40 Playable Words can be made from "COPPER"
   2-Letter Words (7 found)
   3-Letter Words (16 found)
   4-Letter Words (14 found)
   5-Letter Words (2 found)
   6-Letter Words (1 found)