6 letter words:
nonfan9,
nonfat9,
5 letter words:
afoot8,
fanon8,
4 letter words:
fano7,
font7,
foot7,
anon4,
nona4,
noon4,
nota4,
onto4,
toon4,
3 letter words:
aft6,
fan6,
fat6,
fon6,
oaf6,
oft6,
ant3,
nan3,
noo3,
not3,
oat3,
ono3,
oot3,
tan3,
tao3,
ton3,
too3,
2 letter words:
fa5,
of5,
an2,
at2,
na2,
no2,
on2,
ta2,
to2,