5 letter words:
kefir12,
fermi10,
4 letter words:
kerf11,
kief11,
merk10,
mike10,
mirk10,
firm9,
keir8,
kier8,
fire7,
reif7,
rife7,
emir6,
mire6,
miri6,
rime6,
3 letter words:
kef10,
kif10,
fem8,
irk7,
kir7,
fer6,
fie6,
fir6,
ref6,
rif6,
mir5,
rem5,
rim5,
ire3,
rei3,
2 letter words:
ki6,
ef5,
fe5,
if5,
em4,
me4,
mi4,
er2,
re2,