12 letter words:
suppositious16,
7 letter words:
postops11,
pistous9,
tossups9,
ostosis7,
6 letter words:
pipits10,
postop10,
pistou8,
posits8,
ptosis8,
situps8,
spouts8,
stoops8,
stoups8,
tossup8,
uptoss8,
tussis6,
5 letter words:
pipit9,
poops9,
pupus9,
pious7,
pisos7,
posit7,
posts7,
pouts7,
situp7,
soups7,
spits7,
spots7,
spout7,
stoop7,
stops7,
stoup7,
tipis7,
topis7,
topoi7,
topos7,
ousts5,
situs5,
soots5,
stoss5,
suits5,
4 letter words:
pips8,
poop8,
pops8,
pups8,
pupu8,
oops6,
opts6,
opus6,
piso6,
piss6,
pits6,
pois6,
poos6,
post6,
pots6,
pout6,
psis6,
psst6,
ptui6,
puss6,
puts6,
sips6,
sops6,
soup6,
spit6,
spot6,
stop6,
sups6,
tipi6,
tips6,
topi6,
topo6,
tops6,
tups6,
oots4,
oust4,
outs4,
sits4,
soot4,
sots4,
sous4,
suit4,
suss4,
toss4,
tuis4,
3 letter words:
pip7,
pop7,
pup7,
ops5,
opt5,
pis5,
pit5,
piu5,
poi5,
poo5,
pot5,
psi5,
pst5,
pus5,
put5,
sip5,
sop5,
sup5,
tip5,
top5,
tup5,
upo5,
ups5,
its3,
oot3,
out3,
sis3,
sit3,
sos3,
sot3,
sou3,
tis3,
too3,
tui3,
uts3,
2 letter words:
op4,
pi4,
up4,
is2,
it2,
oi2,
os2,
si2,
so2,
ti2,
to2,
us2,
ut2,