5 letter words:
brook11,
iroko9,
broil7,
oboli7,
4 letter words:
bilk10,
birk10,
book10,
bork10,
kobo10,
kilo8,
kolo8,
look8,
rook8,
birl6,
biro6,
boil6,
bolo6,
boor6,
brio6,
broo6,
lobo6,
obol6,
olio4,
roil4,
3 letter words:
kob9,
ilk7,
irk7,
kir7,
koi7,
kor7,
bio5,
boo5,
bro5,
lib5,
lob5,
obi5,
orb5,
rib5,
rob5,
loo3,
oil3,
2 letter words:
ki6,
bi4,
bo4,
li2,
lo2,
oi2,
or2,