7 letter words:
freebee12,
6 letter words:
befret11,
bereft11,
refute9,
5 letter words:
beret7,
brute7,
buret7,
rebut7,
tuber7,
4 letter words:
beef9,
feeb9,
feet7,
fere7,
fete7,
free7,
fret7,
reef7,
reft7,
tref7,
turf7,
beer6,
beet6,
bree6,
brut6,
bute6,
rube6,
tube6,
rete4,
tree4,
true4,
3 letter words:
fub8,
eft6,
fee6,
fer6,
fet6,
feu6,
fur6,
ref6,
bee5,
bet5,
bur5,
but5,
reb5,
rub5,
tub5,
urb5,
ere3,
ree3,
ret3,
rue3,
rut3,
tee3,
ute3,
2 letter words:
ef5,
fe5,
be4,
er2,
et2,
re2,
ut2,