5 letter words:
rumba9,
umbra9,
4 letter words:
gamb9,
barm8,
brag7,
burg7,
garb7,
gaum7,
grab7,
gram7,
grub7,
grum7,
arum6,
bura6,
mura6,
gaur5,
guar5,
ruga5,
3 letter words:
bam7,
bum7,
bag6,
bug6,
gab6,
gam6,
gum6,
mag6,
mug6,
amu5,
arb5,
arm5,
bar5,
bra5,
bur5,
mar5,
ram5,
rub5,
rum5,
urb5,
gar4,
rag4,
rug4,
2 letter words:
ab4,
am4,
ba4,
ma4,
mu4,
um4,
ag3,
ar2,