5 letter words:
baron7,
borna7,
bourn7,
buran7,
unbar7,
urban7,
4 letter words:
barn6,
baur6,
boar6,
bona6,
bora6,
born6,
boun6,
bran6,
buna6,
bura6,
burn6,
ourn4,
raun4,
roan4,
urao4,
3 letter words:
abo5,
arb5,
ban5,
bar5,
boa5,
bon5,
bor5,
bra5,
bro5,
bru5,
bun5,
bur5,
nab5,
nob5,
nub5,
oba5,
orb5,
rob5,
rub5,
urb5,
nor3,
nur3,
oar3,
ora3,
our3,
ran3,
run3,
urn3,
2 letter words:
ab4,
ba4,
bo4,
ob4,
an2,
ar2,
na2,
no2,
nu2,
on2,
or2,
ou2,
un2,
ur2,