6 letter words:
cooter8,
reboot8,
5 letter words:
cooer7,
recto7,
robot7,
4 letter words:
boor6,
boot6,
bore6,
bort6,
broo6,
cero6,
coot6,
core6,
cote6,
oboe6,
robe6,
torc6,
root4,
rote4,
roto4,
tore4,
toro4,
3 letter words:
cob7,
bet5,
boo5,
bot5,
bro5,
coo5,
cor5,
cot5,
obe5,
orb5,
orc5,
reb5,
rec5,
rob5,
roc5,
oot3,
ore3,
ort3,
ret3,
roe3,
rot3,
toe3,
too3,
tor3,
2 letter words:
be4,
bo4,
er2,
et2,
oe2,
or2,
re2,
to2,