5 letter words:
rumba9,
umbra9,
buran7,
unarm7,
unbar7,
urban7,
4 letter words:
barm8,
numb8,
arum6,
barn6,
bran6,
buna6,
bura6,
burn6,
maun6,
mura6,
3 letter words:
bam7,
bum7,
mum7,
umm7,
amu5,
arb5,
arm5,
ban5,
bar5,
bra5,
bun5,
bur5,
man5,
mar5,
mun5,
nab5,
nam5,
nub5,
ram5,
rub5,
rum5,
urb5,
ran3,
run3,
urn3,
2 letter words:
mm6,
ab4,
am4,
ba4,
ma4,
mu4,
um4,
an2,
ar2,
na2,
nu2,
un2,