7 letter words:
fissure10,
fussier10,
6 letter words:
frisks13,
kefirs13,
kisser10,
krises10,
skiers10,
frises9,
furies9,
fusser9,
serifs9,
issuer6,
sieurs6,
5 letter words:
frisk12,
kefir12,
kerfs12,
kiefs12,
kufis12,
keirs9,
kiers9,
risks9,
rusks9,
siker9,
sikes9,
skier9,
skies9,
fires8,
fries8,
frise8,
fuses8,
reifs8,
seifs8,
serfs8,
serif8,
surfs8,
issue5,
rises5,
risus5,
ruses5,
sieur5,
sires5,
suers5,
users5,
4 letter words:
kefs11,
kerf11,
kief11,
kifs11,
kufi11,
irks8,
keir8,
kier8,
kirs8,
kiss8,
kris8,
kues8,
risk8,
rusk8,
sike8,
skis8,
suks8,
ukes8,
fess7,
feus7,
fire7,
firs7,
furs7,
fuse7,
fuss7,
refs7,
reif7,
rife7,
rifs7,
seif7,
serf7,
surf7,
ires4,
reis4,
rise4,
rues4,
ruse4,
seis4,
sers4,
sire4,
sirs4,
sris4,
suer4,
sues4,
sure4,
user4,
uses4,
3 letter words:
kef10,
kif10,
irk7,
kir7,
kis7,
kue7,
ski7,
suk7,
uke7,
efs6,
fer6,
fes6,
feu6,
fie6,
fir6,
fur6,
ifs6,
ref6,
rif6,
ers3,
ess3,
ire3,
rei3,
res3,
rue3,
sei3,
ser3,
sir3,
sis3,
sri3,
sue3,
use3,
2 letter words:
ki6,
ef5,
fe5,
if5,
er2,
es2,
is2,
re2,
si2,
us2,