5 letter words:
enfix15,
feint8,
fient8,
4 letter words:
fixt14,
exit11,
next11,
nixe11,
feni7,
fent7,
fine7,
neif7,
nief7,
nife7,
nite4,
tine4,
3 letter words:
fix13,
nix10,
tex10,
tix10,
eft6,
fen6,
fet6,
fie6,
fin6,
fit6,
nef6,
tef6,
net3,
nie3,
nit3,
ten3,
tie3,
tin3,
2 letter words:
ex9,
xi9,
ef5,
fe5,
if5,
en2,
et2,
in2,
it2,
ne2,
te2,
ti2,