5 letter words:
beget8,
grebe8,
beret7,
egret6,
greet6,
4 letter words:
berg7,
beer6,
beet6,
bree6,
eger5,
gree5,
rete4,
tree4,
3 letter words:
beg6,
bee5,
bet5,
reb5,
erg4,
gee4,
get4,
reg4,
teg4,
ere3,
ree3,
ret3,
tee3,
2 letter words:
be4,
er2,
et2,
re2,