7 letter words:
rebegun10,
6 letter words:
bungee9,
burgee9,
pugree9,
repugn9,
5 letter words:
begun8,
brung8,
grebe8,
purge8,
repeg8,
unpeg8,
preen7,
prune7,
puree7,
rupee7,
genre6,
green6,
enure5,
4 letter words:
prez15,
zebu15,
geez14,
beep8,
burp8,
berg7,
bung7,
burg7,
grub7,
pung7,
been6,
beer6,
bene6,
bree6,
bren6,
burn6,
neep6,
peen6,
peer6,
pere6,
pree6,
pure6,
rube6,
unbe6,
eger5,
gene5,
genu5,
gree5,
grue5,
rung5,
urge5,
erne4,
rune4,
3 letter words:
zep14,
zee12,
pub7,
beg6,
bug6,
peg6,
pug6,
bee5,
ben5,
bun5,
bur5,
neb5,
nub5,
pee5,
pen5,
per5,
pun5,
pur5,
reb5,
rep5,
rub5,
urb5,
urp5,
eng4,
erg4,
gee4,
gen4,
gnu4,
gun4,
neg4,
reg4,
rug4,
ere3,
ern3,
nee3,
ree3,
rue3,
run3,
urn3,
2 letter words:
be4,
pe4,
up4,
en2,
er2,
ne2,
nu2,
re2,
un2,