5 letter words:
fubar10,
rumba9,
umbra9,
4 letter words:
bumf11,
barf9,
farm9,
barm8,
arum6,
bura6,
mura6,
3 letter words:
fab8,
fub8,
bam7,
bum7,
arf6,
far6,
fur6,
amu5,
arb5,
arm5,
bar5,
bra5,
bur5,
mar5,
ram5,
rub5,
rum5,
urb5,
2 letter words:
fa5,
ab4,
am4,
ba4,
ma4,
mu4,
um4,
ar2,