8 letter words:
unfixing19,
6 letter words:
fixing17,
nixing14,
fining10,
5 letter words:
infix15,
unfix15,
fungi9,
4 letter words:
fung8,
fini7,
ginn5,
3 letter words:
fix13,
nix10,
fig7,
fug7,
gif7,
fin6,
fun6,
gin4,
gnu4,
gun4,
inn3,
nun3,
uni3,
2 letter words:
xi9,
xu9,
if5,
gi3,
gu3,
ug3,
in2,
nu2,
un2,