5 letter words:
offer11,
reffo11,
4 letter words:
koff14,
fork11,
keef11,
kerf11,
kero8,
kore8,
reek8,
reke8,
roke8,
feer7,
fere7,
fore7,
free7,
froe7,
orfe7,
reef7,
3 letter words:
kef10,
eff9,
off9,
eek7,
eke7,
erk7,
kor7,
oke7,
rok7,
erf6,
fee6,
fer6,
foe6,
for6,
fro6,
orf6,
ref6,
ere3,
ore3,
ree3,
reo3,
roe3,
2 letter words:
ko6,
ef5,
fe5,
of5,
ee2,
er2,
oe2,
or2,
re2,