5 letter words:
bumpy14,
kombu13,
4 letter words:
poky13,
mopy11,
upby11,
bump10,
buoy9,
umbo8,
3 letter words:
yok10,
yuk10,
kob9,
kop9,
boy8,
buy8,
yob8,
yom8,
yum8,
yup8,
bop7,
bum7,
mob7,
mop7,
pom7,
pub7,
ump7,
you6,
upo5,
2 letter words:
by7,
my7,
oy5,
yo5,
bo4,
mo4,
mu4,
om4,
op4,
um4,
up4,