11 letter words:
niffnaffing24,
8 letter words:
niffnaff20,
7 letter words:
faffing17,
naffing14,
niffing14,
faining11,
fanning11,
finning11,
6 letter words:
fifing13,
fingan10,
fining10,
finnan9,
inning7,
5 letter words:
fagin9,
ingan6,
4 letter words:
faff13,
gaff11,
fifi10,
naff10,
niff10,
fang8,
fain7,
fini7,
naif7,
agin5,
gain5,
ginn5,
inia4,
nain4,
3 letter words:
aff9,
iff9,
fag7,
fig7,
gif7,
fan6,
fin6,
gan4,
gin4,
nag4,
ain3,
ani3,
ann3,
inn3,
nan3,
2 letter words:
fa5,
if5,
ag3,
gi3,
ai2,
an2,
in2,
na2,