8 letter words:
crumbums16,
7 letter words:
crumbum15,
6 letter words:
crumbs12,
5 letter words:
crumb11,
curbs9,
mucus9,
mumus9,
scrub9,
scrum9,
rubus7,
4 letter words:
bums8,
cubs8,
curb8,
mums8,
mumu8,
scum8,
brus6,
burs6,
crus6,
curs6,
rubs6,
rucs6,
rums6,
scur6,
smur6,
urbs6,
urus4,
3 letter words:
bum7,
cub7,
cum7,
mum7,
umm7,
bru5,
bur5,
bus5,
cru5,
cur5,
mus5,
rub5,
ruc5,
rum5,
sub5,
sum5,
umu5,
urb5,
sur3,
2 letter words:
mm6,
mu4,
um4,
ur2,
us2,