5 letter words:
brook11,
iroko9,
4 letter words:
gowk12,
work11,
birk10,
book10,
bork10,
kobo10,
brow9,
gook9,
grok9,
grow8,
rook8,
biog7,
brig7,
gobo7,
biro6,
boor6,
brio6,
broo6,
giro5,
3 letter words:
wok10,
kob9,
bow8,
irk7,
kir7,
koi7,
kor7,
wig7,
wog7,
big6,
bog6,
gib6,
gob6,
row6,
woo6,
bio5,
boo5,
bro5,
obi5,
orb5,
rib5,
rob5,
goo4,
gor4,
rig4,
2 letter words:
ki6,
ow5,
wo5,
bi4,
bo4,
go3,
oi2,
or2,