5 letter words:
brung8,
urubu7,
4 letter words:
bunk10,
burk10,
knub10,
gunk9,
knur8,
kuru8,
bung7,
burg7,
grub7,
burn6,
gurn5,
guru5,
rung5,
3 letter words:
bug6,
gub6,
bru5,
bun5,
bur5,
nub5,
rub5,
urb5,
gnu4,
gun4,
gur4,
rug4,
nur3,
run3,
urn3,
2 letter words:
gu3,
ug3,
nu2,
un2,
ur2,