5 letter words:
bouts7,
4 letter words:
bots6,
bout6,
bust6,
buts6,
stob6,
stub6,
tubs6,
oust4,
outs4,
sout4,
3 letter words:
bos5,
bot5,
bus5,
but5,
obs5,
sob5,
sub5,
tub5,
ous3,
out3,
sot3,
sou3,
uts3,
2 letter words:
bo4,
ob4,
os2,
ou2,
so2,
st2,
to2,
us2,
ut2,