6 letter words:
forren9,
froren9,
frorne9,
ironer6,
5 letter words:
finer8,
firer8,
freon8,
frier8,
frore8,
frorn8,
infer8,
rifer8,
irone5,
rorie5,
4 letter words:
feni7,
fern7,
fier7,
fine7,
fino7,
fire7,
firn7,
foen7,
foin7,
fone7,
fore7,
froe7,
info7,
neif7,
nief7,
nife7,
orfe7,
reif7,
rife7,
inro4,
iron4,
noir4,
nori4,
oner4,
onie4,
rein4,
rine4,
roin4,
rone4,
rore4,
3 letter words:
erf6,
fen6,
fer6,
fie6,
fin6,
fir6,
foe6,
fon6,
for6,
fro6,
nef6,
orf6,
ref6,
rif6,
eon3,
ern3,
err3,
ion3,
ire3,
nie3,
nor3,
one3,
ore3,
rei3,
ren3,
reo3,
rin3,
roe3,
2 letter words:
ef5,
fe5,
if5,
of5,
en2,
er2,
in2,
io2,
ne2,
no2,
oe2,
oi2,
on2,
or2,
re2,