7 letter words:
benefit12,
6 letter words:
butene8,
5 letter words:
befit10,
feint8,
unfit8,
unite5,
untie5,
4 letter words:
beef9,
feeb9,
enuf7,
feet7,
fete7,
fine7,
neif7,
been6,
beet6,
bene6,
bent6,
bine6,
bint6,
bite6,
bunt6,
bute6,
tube6,
unbe6,
etui4,
nite4,
teen4,
tine4,
tune4,
unit4,
3 letter words:
fib8,
fub8,
eft6,
fee6,
fen6,
fet6,
feu6,
fie6,
fin6,
fit6,
fun6,
bee5,
ben5,
bet5,
bin5,
bit5,
bun5,
but5,
neb5,
nib5,
nub5,
tub5,
nee3,
net3,
nit3,
nut3,
tee3,
ten3,
tie3,
tin3,
tui3,
tun3,
ute3,
2 letter words:
ef5,
fe5,
if5,
be4,
bi4,
en2,
et2,
in2,
it2,
ne2,
nu2,
ti2,
un2,
ut2,