7 letter words:
fuehrer13,
further13,
refuter10,
6 letter words:
fuhrer12,
hefter12,
ferret9,
hurter9,
refute9,
ureter6,
5 letter words:
ether8,
freer8,
frere8,
refer8,
there8,
three8,
truer5,
4 letter words:
heft10,
heth10,
feet7,
fere7,
fete7,
free7,
fret7,
here7,
hurt7,
reef7,
reft7,
ruth7,
thee7,
thru7,
tref7,
turf7,
rete4,
ruer4,
tree4,
true4,
3 letter words:
feh9,
heh9,
huh9,
eft6,
eth6,
fee6,
fer6,
fet6,
feu6,
fur6,
her6,
het6,
hue6,
hut6,
ref6,
the6,
ere3,
err3,
ree3,
ret3,
rue3,
rut3,
tee3,
ute3,
2 letter words:
ef5,
eh5,
fe5,
he5,
uh5,
er2,
et2,
re2,
ut2,