5 letter words:
fermi10,
prime9,
4 letter words:
firm9,
perm8,
prim8,
fire7,
reif7,
rife7,
emir6,
mire6,
peri6,
pier6,
rime6,
ripe6,
3 letter words:
fem8,
imp7,
fer6,
fie6,
fir6,
ref6,
rif6,
mir5,
per5,
pie5,
rem5,
rep5,
rim5,
rip5,
ire3,
rei3,
2 letter words:
ef5,
fe5,
if5,
em4,
me4,
mi4,
pe4,
pi4,
er2,
re2,