5 letter words:
gumbo10,
rumbo9,
bourg8,
4 letter words:
borm8,
ombu8,
umbo8,
brog7,
burg7,
gorm7,
grub7,
grum7,
roum6,
3 letter words:
bum7,
mob7,
bog6,
bug6,
gob6,
gub6,
gum6,
mog6,
mug6,
bor5,
bro5,
bru5,
bur5,
mor5,
mou5,
orb5,
rob5,
rom5,
rub5,
rum5,
urb5,
gor4,
gur4,
rug4,
our3,
2 letter words:
bo4,
mo4,
mu4,
ob4,
om4,
um4,
go3,
gu3,
ug3,
or2,
ou2,
ur2,