4 letter words:
bego7,
berg7,
brog7,
bore6,
robe6,
ergo5,
goer5,
gore5,
ogre5,
rego5,
3 letter words:
beg6,
bog6,
gob6,
bor5,
bro5,
obe5,
orb5,
reb5,
rob5,
ego4,
erg4,
geo4,
goe4,
gor4,
reg4,
ore3,
reo3,
roe3,
2 letter words:
be4,
bo4,
ob4,
go3,
er2,
oe2,
or2,
re2,