9 letter words:
humblebee18,
6 letter words:
humble13,
bumble12,
5 letter words:
blume9,
umbel9,
umble9,
belee7,
emule7,
melee7,
4 letter words:
bhel9,
buhl9,
hebe9,
helm9,
heme9,
bleb8,
blub8,
bulb8,
heel7,
hele7,
hule7,
blee6,
blue6,
emeu6,
leme6,
lube6,
mule6,
3 letter words:
hem8,
hub8,
hum8,
bub7,
bum7,
ebb7,
hue6,
bee5,
bel5,
elm5,
eme5,
emu5,
lum5,
mee5,
mel5,
meu5,
eel3,
lee3,
leu3,
ule3,
2 letter words:
hm7,
eh5,
he5,
uh5,
be4,
em4,
me4,
mu4,
um4,
ee2,
el2,
