8 letter words:
properer12,
7 letter words:
expirer16,
6 letter words:
expire15,
poxier15,
proper10,
ripper10,
ropier8,
5 letter words:
piper9,
preop9,
prier7,
prior7,
repro7,
riper7,
roper7,
error5,
4 letter words:
expo13,
prex13,
peep8,
pepo8,
perp8,
pipe8,
pope8,
prep8,
prop8,
repp8,
peer6,
pere6,
peri6,
pier6,
pore6,
pree6,
repo6,
ripe6,
rope6,
3 letter words:
pix12,
pox12,
rex10,
pep7,
pip7,
pop7,
ope5,
pee5,
per5,
pie5,
poi5,
pro5,
rep5,
rip5,
ere3,
err3,
ire3,
ore3,
ree3,
rei3,
roe3,
2 letter words:
ex9,
ox9,
xi9,
op4,
pe4,
pi4,
er2,
oe2,
oi2,
or2,
re2,