5 letter words:
brook11,
buroo7,
4 letter words:
zouk17,
bozo15,
zobo15,
zobu15,
orzo13,
ouzo13,
work11,
boko10,
book10,
bork10,
bouk10,
burk10,
kobo10,
bowr9,
brow9,
koro8,
koru8,
rook8,
boor6,
broo6,
3 letter words:
zoo12,
kow10,
wok10,
bok9,
kob9,
bow8,
kor7,
ouk7,
rok7,
row6,
woo6,
boo5,
bor5,
bro5,
bru5,
bur5,
obo5,
orb5,
rob5,
rub5,
urb5,
oor3,
our3,
roo3,
2 letter words:
zo11,
ko6,
ow5,
wo5,
bo4,
ob4,
oo2,
or2,
ou2,
ur2,