5 letter words:
oupas7,
4 letter words:
apos6,
apso6,
opus6,
oupa6,
oups6,
poas6,
soap6,
soup6,
upas6,
3 letter words:
apo5,
asp5,
ops5,
oup5,
pas5,
poa5,
pos5,
pus5,
sap5,
sop5,
spa5,
sup5,
upo5,
ups5,
ous3,
sau3,
sou3,
2 letter words:
op4,
pa4,
po4,
up4,
as2,
os2,
ou2,
so2,
us2,
