7 letter words:
urbaner9,
6 letter words:
barren8,
burner8,
rurban8,
unbear8,
urbane8,
5 letter words:
barer7,
barre7,
buran7,
rebar7,
unbar7,
urban7,
reran5,
rerun5,
urare5,
4 letter words:
bane6,
bare6,
barn6,
bean6,
bear6,
beau6,
brae6,
bran6,
bren6,
buna6,
bura6,
burn6,
burr6,
nabe6,
rube6,
unbe6,
earn4,
near4,
rare4,
rear4,
ruer4,
rune4,
urea4,
3 letter words:
arb5,
ban5,
bar5,
ben5,
bra5,
brr5,
bun5,
bur5,
nab5,
neb5,
nub5,
reb5,
rub5,
urb5,
ane3,
are3,
ear3,
eau3,
era3,
ern3,
err3,
nae3,
ran3,
rue3,
run3,
urn3,
2 letter words:
ab4,
ba4,
be4,
ae2,
an2,
ar2,
en2,
er2,
na2,
ne2,
nu2,
re2,
un2,