5 letter words:
borer7,
retro5,
4 letter words:
bore6,
bort6,
robe6,
rote4,
tore4,
torr4,
3 letter words:
bet5,
bot5,
bro5,
brr5,
obe5,
orb5,
reb5,
rob5,
err3,
ore3,
ort3,
ret3,
roe3,
rot3,
toe3,
tor3,
2 letter words:
be4,
bo4,
er2,
et2,
oe2,
or2,
re2,
to2,