9 letter words:
tubifexes21,
7 letter words:
tubifex19,
6 letter words:
subfix18,
ibexes15,
befits11,
betise8,
bustee8,
5 letter words:
fixes15,
exies12,
exist12,
exits12,
sixte12,
texes12,
tuxes12,
beefs10,
befit10,
feebs10,
feist8,
fetes8,
fetus8,
fiest8,
fusee8,
beets7,
beset7,
besit7,
besti7,
betes7,
bites7,
buist7,
busti7,
butes7,
tubes7,
etuis5,
suite5,
4 letter words:
fixt14,
ibex13,
exes11,
exit11,
sext11,
beef9,
feeb9,
fibs9,
fubs9,
efts7,
fees7,
feet7,
feis7,
fest7,
fete7,
fets7,
feus7,
fist7,
fits7,
fuse7,
fust7,
seif7,
sift7,
tefs7,
bees6,
beet6,
best6,
bete6,
bets6,
bise6,
bist6,
bite6,
bits6,
bust6,
bute6,
buts6,
stub6,
tube6,
tubs6,
etui4,
site4,
stie4,
suet4,
suit4,
tees4,
ties4,
tuis4,
utes4,
utis4,
3 letter words:
fix13,
sex10,
six10,
tex10,
tix10,
tux10,
xis10,
fib8,
fub8,
efs6,
eft6,
fee6,
fes6,
fet6,
feu6,
fie6,
fit6,
ifs6,
sif6,
tef6,
bee5,
bes5,
bet5,
bis5,
bit5,
bus5,
but5,
sib5,
sub5,
tub5,
est3,
its3,
see3,
sei3,
set3,
sit3,
sue3,
sui3,
tee3,
tes3,
tie3,
tis3,
tui3,
use3,
ute3,
uts3,
2 letter words:
ex9,
xi9,
xu9,
ef5,
fe5,
if5,
be4,
bi4,
ee2,
es2,
et2,
is2,
it2,
si2,
st2,
te2,
ti2,
us2,
ut2,