RUSTS is a playable word

rust Scrabble® Dictionary

verb
rusted, rusting, rusts
to form rust (a reddish coating that forms on iron)
(adjective) rustable
9 Playable Words can be made from "RUSTS"
   2-Letter Words (2 found)
   3-Letter Words (3 found)
   4-Letter Words (2 found)
   5-Letter Words (2 found)