7 letter words:
bummock19,
5 letter words:
bucko13,
kombu13,
4 letter words:
bock12,
buck12,
mock12,
muck12,
bouk10,
comb10,
comm10,
ombu8,
umbo8,
3 letter words:
bok9,
kob9,
bum7,
cob7,
cub7,
cum7,
mob7,
moc7,
mom7,
mum7,
ouk7,
umm7,
mou5,
2 letter words:
ko6,
mm6,
bo4,
mo4,
mu4,
ob4,
om4,
um4,
ou2,
