5 letter words:
brook11,
iroko9,
oribi7,
4 letter words:
fork11,
kiwi11,
work11,
birk10,
book10,
bork10,
frow10,
kobo10,
woof10,
brow9,
forb9,
rook8,
roof7,
biro6,
boor6,
brio6,
broo6,
3 letter words:
kif10,
wok10,
kob9,
bow8,
fib8,
fob8,
irk7,
kir7,
koi7,
kor7,
fir6,
for6,
fro6,
rif6,
row6,
woo6,
bio5,
boo5,
bro5,
obi5,
orb5,
rib5,
rob5,
2 letter words:
ki6,
if5,
of5,
ow5,
wo5,
bi4,
bo4,
oi2,
or2,