6 letter words:
bookoo12,
5 letter words:
brook11,
kroon9,
boron7,
4 letter words:
jook15,
boko10,
bonk10,
book10,
bork10,
knob10,
kobo10,
koro8,
nook8,
nork8,
rook8,
boon6,
boor6,
born6,
broo6,
roon4,
3 letter words:
job12,
jor10,
bok9,
kob9,
kon7,
kor7,
rok7,
bon5,
boo5,
bor5,
bro5,
nob5,
obo5,
orb5,
rob5,
noo3,
nor3,
ono3,
oon3,
oor3,
roo3,
2 letter words:
jo9,
ko6,
bo4,
ob4,
no2,
on2,
oo2,
or2,