9 letter words:
thriftier15,
7 letter words:
fritter10,
riftier10,
6 letter words:
thrift12,
fitter9,
hitter9,
titfer9,
tither9,
ritter6,
territ6,
tirrit6,
triter6,
5 letter words:
firth11,
frith11,
theft11,
thief11,
firer8,
firie8,
fitte8,
freit8,
frier8,
fritt8,
hirer8,
ither8,
refit8,
rifer8,
rifte8,
their8,
tithe8,
treif8,
tetri5,
titer5,
titre5,
trier5,
trite5,
4 letter words:
heft10,
fett7,
fier7,
fire7,
fitt7,
fret7,
frit7,
heir7,
hire7,
reft7,
reif7,
rife7,
rift7,
tehr7,
terf7,
teth7,
thir7,
tift7,
tref7,
rite4,
ritt4,
tier4,
tire4,
tirr4,
tite4,
titi4,
tret4,
trie4,
3 letter words:
feh9,
eft6,
erf6,
eth6,
fer6,
fet6,
fie6,
fir6,
fit6,
her6,
het6,
hie6,
hit6,
ref6,
reh6,
rif6,
tef6,
the6,
err3,
ire3,
rei3,
ret3,
rit3,
tet3,
tie3,
tit3,
2 letter words:
ef5,
eh5,
fe5,
he5,
hi5,
if5,
er2,
et2,
it2,
re2,
te2,
ti2,