REZERO is a playable word

rezero Scrabble® Dictionary

verb
rezeroed, rezeroing, rezeroes or rezeros
to reset (a gauge) back to zero
13 Playable Words can be made from "REZERO"
   2-Letter Words (4 found)
   3-Letter Words (7 found)
   4-Letter Words (1 found)
   6-Letter Words (1 found)