5 letter words:
berks11,
kerbs11,
treks9,
4 letter words:
berk10,
kebs10,
kerb10,
erks8,
kest8,
kets8,
sekt8,
serk8,
sker8,
sket8,
trek8,
best6,
bets6,
rebs6,
erst4,
rest4,
rets4,
tres4,
3 letter words:
keb9,
erk7,
ket7,
tsk7,
bes5,
bet5,
reb5,
ers3,
est3,
res3,
ret3,
ser3,
set3,
tes3,
2 letter words:
be4,
er2,
es2,
et2,
re2,
st2,
te2,