5 letter words:
brook11,
iroko9,
koori9,
4 letter words:
hoik11,
hoki11,
hook11,
khor11,
birk10,
boko10,
book10,
bork10,
brik10,
kobo10,
boho9,
booh9,
hobo9,
koro8,
rook8,
hori7,
biro6,
boor6,
brio6,
broo6,
3 letter words:
khi10,
bok9,
kob9,
boh8,
hob8,
irk7,
kir7,
koi7,
kor7,
oik7,
rok7,
hoi6,
hoo6,
oho6,
ooh6,
rho6,
bio5,
boi5,
boo5,
bor5,
bro5,
obi5,
obo5,
orb5,
rib5,
rob5,
oor3,
roo3,
2 letter words:
ki6,
ko6,
hi5,
ho5,
oh5,
bi4,
bo4,
ob4,
io2,
oi2,
oo2,
or2,