6 letter words:
booker12,
rebook12,
5 letter words:
broke11,
brook11,
ebook11,
4 letter words:
fork11,
kerf11,
berk10,
book10,
bork10,
kerb10,
kobo10,
forb9,
kore8,
rook8,
fore7,
froe7,
roof7,
boor6,
bore6,
broo6,
oboe6,
robe6,
3 letter words:
kef10,
kob9,
fob8,
kor7,
oke7,
fer6,
foe6,
for6,
fro6,
ref6,
boo5,
bro5,
obe5,
orb5,
reb5,
rob5,
ore3,
roe3,
2 letter words:
ef5,
fe5,
of5,
be4,
bo4,
er2,
oe2,
or2,
re2,