5 letter words:
about7,
4 letter words:
abut6,
boat6,
bota6,
bout6,
tabu6,
tuba6,
auto4,
3 letter words:
aba5,
abo5,
baa5,
bat5,
boa5,
bot5,
but5,
oba5,
tab5,
tub5,
oat3,
out3,
tao3,
tau3,
uta3,
2 letter words:
ab4,
ba4,
bo4,
aa2,
at2,
ta2,
to2,
ut2,