7 letter words:
rebegun10,
6 letter words:
refuge10,
bungee9,
burgee9,
unfree9,
5 letter words:
begun8,
brung8,
grebe8,
genre6,
green6,
enure5,
4 letter words:
beef9,
feeb9,
frug8,
berg7,
bung7,
burg7,
enuf7,
fere7,
fern7,
free7,
grub7,
reef7,
been6,
beer6,
bene6,
bree6,
bren6,
burn6,
rube6,
unbe6,
eger5,
gene5,
genu5,
gree5,
grue5,
rung5,
urge5,
erne4,
rune4,
3 letter words:
fub8,
fug7,
beg6,
bug6,
fee6,
fen6,
fer6,
feu6,
fun6,
fur6,
ref6,
bee5,
ben5,
bun5,
bur5,
neb5,
nub5,
reb5,
rub5,
urb5,
eng4,
erg4,
gee4,
gen4,
gnu4,
gun4,
neg4,
reg4,
rug4,
ere3,
ern3,
nee3,
ree3,
rue3,
run3,
urn3,
2 letter words:
ef5,
fe5,
be4,
en2,
er2,
ne2,
nu2,
re2,
un2,