6 letter words:
finito9,
5 letter words:
faint8,
fount8,
futon8,
unfit8,
tauon5,
4 letter words:
fain7,
fano7,
faun7,
fiat7,
fino7,
foin7,
font7,
info7,
naif7,
tofu7,
tufa7,
anti4,
aunt4,
auto4,
inia4,
inti4,
into4,
iota4,
naoi4,
nota4,
tain4,
tuna4,
unai4,
unit4,
unto4,
3 letter words:
aft6,
fan6,
fat6,
fin6,
fit6,
fon6,
fou6,
fun6,
oaf6,
oft6,
ain3,
ait3,
ani3,
ant3,
ion3,
nit3,
not3,
nut3,
oat3,
out3,
tan3,
tao3,
tau3,
tin3,
ton3,
tui3,
tun3,
uta3,
2 letter words:
fa5,
if5,
of5,
ai2,
an2,
at2,
in2,
it2,
na2,
no2,
nu2,
oi2,
on2,
ta2,
ti2,
to2,
un2,
ut2,