7 letter words:
bergere10,
5 letter words:
gerbe8,
grebe8,
breer7,
brere7,
4 letter words:
berg7,
beer6,
bere6,
bree6,
brer6,
eger5,
gere5,
gree5,
3 letter words:
beg6,
bee5,
brr5,
reb5,
erg4,
gee4,
reg4,
ere3,
err3,
ree3,
2 letter words:
be4,
ee2,
er2,
re2,