7 letter words:
rebegun10,
6 letter words:
bebung11,
bergen9,
bungee9,
bunger9,
burgee9,
5 letter words:
rebbe9,
begun8,
brung8,
gebur8,
gerbe8,
grebe8,
genre6,
gerne6,
green6,
enure5,
4 letter words:
burb8,
berg7,
bung7,
burg7,
grub7,
been6,
beer6,
bene6,
bere6,
bree6,
bren6,
burn6,
rube6,
unbe6,
eger5,
euge5,
gene5,
genu5,
gere5,
gree5,
gren5,
grue5,
gurn5,
rung5,
urge5,
erne4,
reen4,
rune4,
3 letter words:
bub7,
ebb7,
beg6,
bug6,
gub6,
bee5,
ben5,
bru5,
bun5,
bur5,
neb5,
nub5,
reb5,
rub5,
urb5,
eng4,
erg4,
gee4,
gen4,
gnu4,
gue4,
gun4,
gur4,
neg4,
reg4,
rug4,
een3,
ene3,
ere3,
ern3,
nee3,
nur3,
ree3,
ren3,
rue3,
run3,
ure3,
urn3,
2 letter words:
be4,
gu3,
ug3,
ee2,
en2,
er2,
ne2,
nu2,
re2,
un2,
ur2,