5 letter words:
firer8,
frier8,
rifer8,
prier7,
riper7,
4 letter words:
fire7,
reif7,
rife7,
peri6,
pier6,
ripe6,
3 letter words:
fer6,
fie6,
fir6,
ref6,
rif6,
per5,
pie5,
rep5,
rip5,
err3,
ire3,
rei3,
2 letter words:
ef5,
fe5,
if5,
pe4,
pi4,
er2,
re2,