5 letter words:
biker11,
4 letter words:
berk10,
bike10,
birk10,
brik10,
kerb10,
kibe10,
keir8,
kier8,
reek8,
reik8,
reke8,
beer6,
bere6,
bier6,
bree6,
brei6,
brie6,
3 letter words:
keb9,
eek7,
eik7,
eke7,
erk7,
irk7,
kir7,
bee5,
reb5,
rib5,
ere3,
ire3,
ree3,
rei3,
2 letter words:
ki6,
be4,
bi4,
ee2,
er2,
re2,