6 letter words:
burler8,
5 letter words:
bluer7,
rubel7,
ruble7,
lurer5,
ruler5,
4 letter words:
blue6,
blur6,
burl6,
burr6,
lube6,
rube6,
lure4,
ruer4,
rule4,
3 letter words:
bel5,
brr5,
bur5,
reb5,
rub5,
urb5,
err3,
leu3,
rue3,
2 letter words:
be4,
el2,
er2,
re2,