6 letter words:
pronto8,
proton8,
uproot8,
uptorn8,
unroot6,
5 letter words:
porno7,
punto7,
puton7,
troop7,
4 letter words:
poop8,
prop8,
poon6,
poor6,
porn6,
port6,
pour6,
pout6,
punt6,
roup6,
topo6,
trop6,
upon6,
onto4,
root4,
roto4,
rout4,
runt4,
toon4,
torn4,
toro4,
tour4,
turn4,
unto4,
3 letter words:
pop7,
pup7,
opt5,
poo5,
pot5,
pro5,
pun5,
pur5,
put5,
top5,
tup5,
upo5,
urp5,
noo3,
nor3,
not3,
nut3,
ono3,
oot3,
ort3,
our3,
out3,
rot3,
run3,
rut3,
ton3,
too3,
tor3,
tun3,
urn3,
2 letter words:
op4,
up4,
no2,
nu2,
on2,
or2,
to2,
un2,
ut2,