8 letter words:
nonurban10,
6 letter words:
unborn8,
5 letter words:
baron7,
bourn7,
buran7,
unban7,
unbar7,
urban7,
4 letter words:
barn6,
boar6,
bora6,
born6,
bran6,
buna6,
bunn6,
bura6,
burn6,
anon4,
nona4,
noun4,
roan4,
3 letter words:
abo5,
arb5,
ban5,
bar5,
boa5,
bra5,
bro5,
bun5,
bur5,
nab5,
nob5,
nub5,
oba5,
orb5,
rob5,
rub5,
urb5,
nan3,
nor3,
nun3,
oar3,
ora3,
our3,
ran3,
run3,
urn3,
2 letter words:
ab4,
ba4,
bo4,
an2,
ar2,
na2,
no2,
nu2,
on2,
or2,
un2,
