5 letter words:
fount8,
futon8,
unfit8,
4 letter words:
fino7,
foin7,
font7,
info7,
tofu7,
into4,
nout4,
oint4,
toun4,
unit4,
unto4,
3 letter words:
fin6,
fit6,
fon6,
fou6,
fun6,
oft6,
ufo6,
ion3,
nit3,
not3,
nut3,
out3,
tin3,
ton3,
tui3,
tun3,
uni3,
utu3,
2 letter words:
if5,
of5,
in2,
io2,
it2,
no2,
nu2,
oi2,
on2,
ou2,
ti2,
to2,
un2,
ut2,