5 letter words:
brook11,
4 letter words:
jook15,
boko10,
book10,
bork10,
kobo10,
koro8,
rook8,
boor6,
broo6,
3 letter words:
job12,
jor10,
bok9,
kob9,
kor7,
rok7,
boo5,
bor5,
bro5,
obo5,
orb5,
rob5,
oor3,
roo3,
2 letter words:
jo9,
ko6,
bo4,
ob4,
oo2,
or2,