9 letter words:
sumptuous13,
7 letter words:
spumous11,
6 letter words:
possum10,
sputum10,
stomps10,
stumps10,
upmost10,
spouts8,
stoups8,
tossup8,
uptoss8,
5 letter words:
stomp9,
stump9,
sumps9,
tumps9,
mosts7,
musts7,
posts7,
pouts7,
smuts7,
soups7,
spots7,
spout7,
stops7,
stoup7,
stums7,
sumos7,
ousts5,
4 letter words:
mops8,
poms8,
sump8,
tump8,
umps8,
moss6,
most6,
mots6,
muss6,
must6,
muts6,
opts6,
opus6,
post6,
pots6,
pout6,
psst6,
puss6,
puts6,
smut6,
soms6,
sops6,
soup6,
spot6,
stop6,
stum6,
sumo6,
sums6,
sups6,
toms6,
tops6,
tups6,
oust4,
outs4,
sots4,
sous4,
toss4,
3 letter words:
mop7,
pom7,
ump7,
mos5,
mot5,
mus5,
mut5,
oms5,
ops5,
opt5,
pot5,
pst5,
pus5,
put5,
som5,
sop5,
sum5,
sup5,
tom5,
top5,
tup5,
upo5,
ups5,
out3,
sos3,
sot3,
sou3,
uts3,
2 letter words:
mo4,
mu4,
om4,
op4,
um4,
up4,
os2,
so2,
to2,
us2,
ut2,