6 letter words:
suffix19,
5 letter words:
affix18,
4 letter words:
faix14,
faux14,
axis11,
aufs7,
3 letter words:
fax13,
fix13,
sax10,
six10,
xis10,
aff9,
iff9,
auf6,
fas6,
ifs6,
sif6,
ais3,
sai3,
sau3,
sui3,
2 letter words:
ax9,
xi9,
xu9,
fa5,
if5,
ai2,
as2,
is2,
si2,
us2,