6 letter words:
rhumbs13,
5 letter words:
rhumb12,
brush10,
buhrs10,
shrub10,
4 letter words:
buhr9,
bush9,
hubs9,
hums9,
mush9,
bums8,
rhus7,
rush7,
brus6,
burs6,
rubs6,
rums6,
smur6,
urbs6,
3 letter words:
hub8,
hum8,
bum7,
bru5,
bur5,
bus5,
mus5,
rub5,
rum5,
sub5,
sum5,
urb5,
sur3,
2 letter words:
hm7,
sh5,
uh5,
mu4,
um4,
ur2,
us2,