5 letter words:
pious7,
4 letter words:
zips15,
pows9,
swop9,
wisp9,
wops9,
opus6,
piso6,
pois6,
soup6,
3 letter words:
wiz15,
zip14,
pow8,
wop8,
sow6,
wis6,
wos6,
ops5,
pis5,
piu5,
poi5,
psi5,
pus5,
sip5,
sop5,
sup5,
upo5,
ups5,
sou3,
2 letter words:
ow5,
wo5,
op4,
pi4,
up4,
is2,
oi2,
os2,
si2,
so2,
us2,