7 letter words:
propine11,
6 letter words:
nipper10,
pepino10,
orpine8,
pernio8,
5 letter words:
piper9,
preop9,
opine7,
orpin7,
prion7,
prone7,
repin7,
ripen7,
irone5,
4 letter words:
pepo8,
perp8,
pipe8,
pope8,
prep8,
prop8,
repp8,
nope6,
open6,
pein6,
peon6,
peri6,
pier6,
pine6,
pion6,
pirn6,
pone6,
pore6,
porn6,
repo6,
ripe6,
rope6,
inro4,
iron4,
noir4,
nori4,
rein4,
3 letter words:
pep7,
pip7,
pop7,
nip5,
ope5,
pen5,
per5,
pie5,
pin5,
poi5,
pro5,
rep5,
rip5,
eon3,
ern3,
ion3,
ire3,
nor3,
one3,
ore3,
rei3,
rin3,
roe3,
2 letter words:
op4,
pe4,
pi4,
en2,
er2,
in2,
ne2,
no2,
oe2,
oi2,
on2,
or2,
re2,
