4 letter words:
baft9,
bapu8,
faut7,
tufa7,
abut6,
buat6,
patu6,
tabu6,
tapu6,
tuba6,
upta6,
3 letter words:
fab8,
fap8,
fub8,
bap7,
pub7,
aft6,
auf6,
fat6,
apt5,
bat5,
but5,
pat5,
put5,
tab5,
tap5,
tub5,
tup5,
tau3,
uta3,
2 letter words:
fa5,
ab4,
ba4,
pa4,
up4,
at2,
ta2,
ut2,