5 letter words:
abuna7,
buran7,
unbar7,
urban7,
ruana5,
4 letter words:
arba6,
barn6,
baur6,
bran6,
buna6,
bura6,
burn6,
arna4,
aura4,
rana4,
raun4,
3 letter words:
aba5,
arb5,
baa5,
ban5,
bar5,
bra5,
bru5,
bun5,
bur5,
nab5,
nub5,
rub5,
urb5,
ana3,
aua3,
nur3,
ran3,
run3,
urn3,
2 letter words:
ab4,
ba4,
aa2,
an2,
ar2,
na2,
nu2,
un2,
ur2,