6 letter words:
utopia8,
5 letter words:
about7,
biota7,
patio7,
4 letter words:
abut6,
atop6,
bait6,
boat6,
bota6,
bout6,
obia6,
obit6,
pita6,
pout6,
ptui6,
tabu6,
topi6,
tuba6,
auto4,
iota4,
3 letter words:
bap7,
bop7,
pub7,
abo5,
apo5,
apt5,
bat5,
bio5,
bit5,
boa5,
bot5,
but5,
oba5,
obi5,
opt5,
pat5,
pia5,
pit5,
piu5,
poi5,
pot5,
put5,
tab5,
tap5,
tip5,
top5,
tub5,
tup5,
upo5,
ait3,
oat3,
out3,
tao3,
tau3,
tui3,
uta3,
2 letter words:
ab4,
ba4,
bi4,
bo4,
op4,
pa4,
pi4,
up4,
ai2,
at2,
it2,
oi2,
ta2,
ti2,
to2,
ut2,