7 letter words:
offerer13,
reoffer13,
6 letter words:
effeir12,
refire9,
5 letter words:
fifer11,
offer11,
reffo11,
ferer8,
fiere8,
firer8,
freer8,
frere8,
frier8,
frore8,
refer8,
rifer8,
rorie5,
4 letter words:
fief10,
fife10,
riff10,
feer7,
fere7,
fier7,
fire7,
fore7,
free7,
froe7,
orfe7,
reef7,
reif7,
rife7,
rore4,
3 letter words:
eff9,
iff9,
off9,
erf6,
fee6,
fer6,
fie6,
fir6,
foe6,
for6,
fro6,
orf6,
ref6,
rif6,
ere3,
err3,
ire3,
ore3,
ree3,
rei3,
reo3,
roe3,
2 letter words:
ef5,
fe5,
if5,
of5,
ee2,
er2,
io2,
oe2,
oi2,
or2,
re2,