7 letter words:
referee10,
6 letter words:
reefer9,
5 letter words:
freer8,
frere8,
refer8,
emeer7,
merer7,
4 letter words:
feme9,
fere7,
free7,
reef7,
mere6,
3 letter words:
fem8,
fee6,
fer6,
ref6,
eme5,
rem5,
ere3,
err3,
ree3,
2 letter words:
ef5,
fe5,
em4,
me4,
er2,
re2,