4 letter words:
gook9,
grok9,
kero8,
kore8,
koro8,
roke8,
rook8,
ergo5,
goer5,
goor5,
gore5,
ogre5,
rego5,
3 letter words:
keg8,
erk7,
kor7,
oke7,
rok7,
ego4,
erg4,
geo4,
goe4,
goo4,
gor4,
reg4,
oor3,
ore3,
reo3,
roe3,
roo3,
2 letter words:
ko6,
go3,
er2,
oe2,
oo2,
or2,
re2,