5 letter words:
buist7,
busti7,
4 letter words:
bist6,
bits6,
bust6,
buts6,
stub6,
tubs6,
suit4,
tuis4,
utis4,
3 letter words:
bis5,
bit5,
bus5,
but5,
sib5,
sub5,
tub5,
its3,
sit3,
sui3,
tis3,
tui3,
uts3,
2 letter words:
bi4,
is2,
it2,
si2,
st2,
ti2,
us2,
ut2,