8 letter words:
fixation18,
6 letter words:
finito9,
5 letter words:
fixit15,
infix15,
axion12,
taxon12,
toxin12,
faint8,
fitna8,
4 letter words:
faix14,
fixt14,
axon11,
ixia11,
taxi11,
fain7,
fano7,
fiat7,
fini7,
fino7,
foin7,
font7,
info7,
naif7,
anti4,
inia4,
inti4,
into4,
iota4,
naoi4,
nota4,
oint4,
tain4,
3 letter words:
fax13,
fix13,
fox13,
nix10,
nox10,
tax10,
tix10,
aft6,
fan6,
fat6,
fin6,
fit6,
fon6,
oaf6,
oft6,
ain3,
ait3,
ani3,
ant3,
ion3,
ita3,
nat3,
nit3,
not3,
oat3,
tai3,
tan3,
tao3,
tin3,
ton3,
2 letter words:
ax9,
ox9,
xi9,
fa5,
if5,
of5,
ai2,
an2,
at2,
in2,
io2,
it2,
na2,
no2,
oi2,
on2,
ta2,
ti2,
to2,