4 letter words:
prow9,
oppo8,
poop8,
prop8,
pupu8,
poor6,
pour6,
proo6,
purr6,
roop6,
roup6,
rurp6,
ruru4,
3 letter words:
pow8,
wop8,
pop7,
pup7,
row6,
woo6,
oop5,
oup5,
poo5,
pro5,
pur5,
upo5,
urp5,
oor3,
our3,
roo3,
2 letter words:
ow5,
wo5,
op4,
po4,
up4,
oo2,
or2,
ou2,
ur2,