8 letter words:
infusing12,
7 letter words:
finings11,
6 letter words:
fining10,
fusing10,
sining7,
5 letter words:
fungi9,
fungs9,
finis8,
suing6,
using6,
4 letter words:
figs8,
fugs8,
fung8,
fini7,
fins7,
funs7,
ginn5,
gins5,
gnus5,
guns5,
sign5,
sing5,
snig5,
snug5,
sung5,
inns4,
nisi4,
nuns4,
sunn4,
unis4,
3 letter words:
fig7,
fug7,
gif7,
fin6,
fun6,
ifs6,
sif6,
gin4,
gis4,
gnu4,
gun4,
gus4,
ugs4,
inn3,
ins3,
nis3,
nun3,
nus3,
sin3,
sui3,
sun3,
uni3,
uns3,
2 letter words:
if5,
gi3,
gu3,
ug3,
in2,
is2,
nu2,
si2,
un2,
us2,
