7 letter words:
expirer16,
6 letter words:
expire15,
5 letter words:
prier7,
riper7,
4 letter words:
prex13,
peer6,
pere6,
peri6,
pier6,
pree6,
ripe6,
3 letter words:
pix12,
rex10,
pee5,
per5,
pie5,
rep5,
rip5,
ere3,
err3,
ire3,
ree3,
rei3,
2 letter words:
ex9,
xi9,
pe4,
pi4,
er2,
re2,