5 letter words:
flour8,
fluor8,
furol8,
4 letter words:
filo7,
flir7,
flor7,
foil7,
foul7,
four7,
furl7,
rolf7,
loir4,
lour4,
roil4,
roul4,
3 letter words:
fil6,
fir6,
flu6,
for6,
fou6,
fro6,
fur6,
orf6,
rif6,
ufo6,
lor3,
lou3,
lur3,
oil3,
our3,
2 letter words:
if5,
of5,
io2,
li2,
lo2,
oi2,
or2,
ou2,
ur2,