5 letter words:
triff11,
4 letter words:
riff10,
tiff10,
toff10,
fort7,
frit7,
rift7,
riot4,
roti4,
tiro4,
tori4,
trio4,
3 letter words:
iff9,
off9,
fir6,
fit6,
for6,
fro6,
oft6,
orf6,
rif6,
ort3,
rit3,
rot3,
tor3,
2 letter words:
if5,
of5,
io2,
it2,
oi2,
or2,
ti2,
to2,