5 letter words:
noups7,
opsin7,
pions7,
pious7,
psion7,
4 letter words:
nips6,
noup6,
opus6,
oups6,
pins6,
pion6,
piso6,
pois6,
pons6,
puns6,
snip6,
soup6,
spin6,
spun6,
upon6,
ions4,
nous4,
onus4,
unis4,
3 letter words:
nip5,
ops5,
oup5,
pin5,
pis5,
piu5,
poi5,
pos5,
psi5,
pun5,
pus5,
sip5,
sop5,
sup5,
upo5,
ups5,
ins3,
ion3,
ios3,
iso3,
nis3,
nos3,
nus3,
ons3,
ous3,
sin3,
son3,
sou3,
sui3,
sun3,
uni3,
uns3,
2 letter words:
op4,
pi4,
po4,
up4,
in2,
io2,
is2,
no2,
nu2,
oi2,
on2,
os2,
ou2,
si2,
so2,
un2,
us2,