6 letter words:
kefirs13,
5 letter words:
fikes12,
firks12,
frisk12,
kefir12,
kerfs12,
kiefs12,
keirs9,
kiers9,
reiks9,
siker9,
skier9,
fiers8,
fires8,
fries8,
frise8,
reifs8,
serif8,
4 letter words:
fike11,
firk11,
fisk11,
kefs11,
kerf11,
kief11,
kifs11,
eiks8,
erks8,
irks8,
keir8,
kier8,
kirs8,
kris8,
reik8,
risk8,
seik8,
serk8,
sike8,
sker8,
feis7,
fier7,
fire7,
firs7,
fris7,
refs7,
reif7,
rife7,
rifs7,
seif7,
serf7,
ires4,
reis4,
rise4,
seir4,
sire4,
3 letter words:
kef10,
kif10,
eik7,
erk7,
irk7,
kir7,
kis7,
sik7,
ski7,
efs6,
erf6,
fer6,
fes6,
fie6,
fir6,
ifs6,
ref6,
rif6,
sif6,
ers3,
ire3,
rei3,
res3,
sei3,
ser3,
sir3,
sri3,
2 letter words:
ki6,
ef5,
fe5,
if5,
er2,
es2,
is2,
re2,
si2,