6 letter words:
oboist8,
oobits8,
5 letter words:
bitos7,
boost7,
boots7,
obits7,
oobit7,
poots7,
posit7,
spoot7,
stoop7,
topis7,
topoi7,
topos7,
4 letter words:
bops8,
bios6,
bist6,
bito6,
bits6,
bois6,
boos6,
boot6,
bots6,
obis6,
obit6,
obos6,
oops6,
opts6,
piso6,
pits6,
pois6,
poos6,
poot6,
post6,
pots6,
soop6,
spit6,
spot6,
stob6,
stop6,
tips6,
topi6,
topo6,
tops6,
oots4,
soot4,
3 letter words:
bop7,
bio5,
bis5,
bit5,
boi5,
boo5,
bos5,
bot5,
obi5,
obo5,
obs5,
oop5,
ops5,
opt5,
pis5,
pit5,
poi5,
poo5,
pos5,
pot5,
psi5,
pst5,
sib5,
sip5,
sob5,
sop5,
tip5,
top5,
ios3,
iso3,
its3,
oos3,
oot3,
sit3,
sot3,
tis3,
too3,
2 letter words:
bi4,
bo4,
ob4,
op4,
pi4,
po4,
io2,
is2,
it2,
oi2,
oo2,
os2,
si2,
so2,
st2,
ti2,
to2,