7 letter words:
gruffer14,
6 letter words:
refuge10,
5 letter words:
gruff12,
ruffe11,
freer8,
frere8,
refer8,
urger6,
4 letter words:
guff11,
ruff10,
frug8,
fere7,
free7,
reef7,
eger5,
gree5,
grue5,
urge5,
ruer4,
3 letter words:
eff9,
fug7,
fee6,
fer6,
feu6,
fur6,
ref6,
erg4,
gee4,
reg4,
rug4,
ere3,
err3,
ree3,
rue3,
2 letter words:
ef5,
fe5,
er2,
re2,