5 letter words:
bluer7,
brule7,
rubel7,
ruble7,
4 letter words:
blue6,
blur6,
bren6,
burl6,
burn6,
lube6,
rube6,
unbe6,
lune4,
lure4,
nurl4,
rule4,
rune4,
3 letter words:
bel5,
ben5,
bru5,
bun5,
bur5,
neb5,
nub5,
reb5,
rub5,
urb5,
ern3,
leu3,
lur3,
nur3,
ren3,
rue3,
run3,
ule3,
ure3,
urn3,
2 letter words:
be4,
el2,
en2,
er2,
ne2,
nu2,
re2,
un2,
ur2,