6 letter word: R S T E O R

3 letter words:
Err
Orr
Roe
Rot
Set
Sot
Toe
Tor

4 letter words
Errs
Erst
Ores
Rest
Roes
Rose
Rote
Rots
Sore
Sort
Toes
Tore
Tords

5 letter words
Retro
Sorer

6 letter words
Resort
Retros
Roster
Sorter