6 letter words:
lipper10,
ripple10,
5 letter words:
piper9,
peril7,
plier7,
4 letter words:
perp8,
pipe8,
prep8,
repp8,
lipe6,
peri6,
pier6,
pile6,
plie6,
ripe6,
lier4,
lire4,
riel4,
rile4,
3 letter words:
pep7,
pip7,
lip5,
per5,
pie5,
rep5,
rip5,
ire3,
lei3,
lie3,
rei3,
2 letter words:
pe4,
pi4,
el2,
er2,
li2,
re2,