9 letter words:
unpopular13,
7 letter words:
popular11,
6 letter words:
poplar10,
prolan8,
5 letter words:
pupal9,
apron7,
nopal7,
parol7,
polar7,
ulpan7,
loran5,
lunar5,
ulnar5,
4 letter words:
palp8,
plop8,
prop8,
pulp8,
pupa8,
pupu8,
loup6,
opal6,
plan6,
porn6,
pour6,
prao6,
prau6,
proa6,
pula6,
puna6,
purl6,
roup6,
upon6,
loan4,
lorn4,
lour4,
luau4,
luna4,
nurl4,
oral4,
roan4,
ulan4,
ulna4,
unau4,
3 letter words:
app7,
pap7,
pop7,
pup7,
alp5,
apo5,
lap5,
lop5,
nap5,
pal5,
pan5,
par5,
pol5,
pro5,
pul5,
pun5,
pur5,
rap5,
upo5,
urp5,
lar3,
nor3,
oar3,
ora3,
our3,
ran3,
run3,
ulu3,
urn3,
2 letter words:
op4,
pa4,
up4,
al2,
an2,
ar2,
la2,
lo2,
na2,
no2,
nu2,
on2,
or2,
un2,
