The anagram of RETROT Is "retort."You can also spell the shorter words retro, otter, tore, tote, trot, tort, err, rot, tot, or, and to.
Revert
The unscrambled version of this word is 'elevator'.
EL ER ET RE EEL ERE ERR LEE LET REE RET TEE TEL LEER LEET REEL RETE TEEL TELE TREE RELET
Those letters can be used to spell "alternate".