5 letter words:
fauna8,
4 letter words:
daff11,
duff11,
naff10,
nuff10,
fand8,
fund8,
faan7,
faun7,
duan5,
nada5,
3 letter words:
aff9,
fad7,
fud7,
auf6,
faa6,
fan6,
fun6,
and4,
dan4,
dun4,
ana3,
aua3,
2 letter words:
fa5,
ad3,
da3,
aa2,
an2,
na2,
nu2,
un2,