5 letter words:
noups7,
porns7,
pours7,
roups7,
spurn7,
urson5,
4 letter words:
noup6,
opus6,
oups6,
pons6,
porn6,
pour6,
pros6,
puns6,
purs6,
roup6,
soup6,
spun6,
spur6,
upon6,
urps6,
nous4,
nurs4,
onus4,
ourn4,
ours4,
runs4,
sorn4,
sour4,
urns4,
3 letter words:
ops5,
oup5,
pos5,
pro5,
pun5,
pur5,
pus5,
sop5,
sup5,
upo5,
ups5,
urp5,
nor3,
nos3,
nur3,
nus3,
ons3,
ors3,
our3,
ous3,
run3,
son3,
sou3,
sun3,
sur3,
uns3,
urn3,
2 letter words:
op4,
po4,
up4,
no2,
nu2,
on2,
or2,
os2,
ou2,
so2,
un2,
ur2,
us2,