9 letter words:
preferrer14,
8 letter words:
referrer11,
6 letter words:
prefer11,
reefer9,
5 letter words:
ferer8,
freer8,
frere8,
refer8,
4 letter words:
feer7,
fere7,
free7,
reef7,
epee6,
peer6,
pere6,
pree6,
3 letter words:
erf6,
fee6,
fer6,
ref6,
pee5,
per5,
pre5,
rep5,
ere3,
err3,
ree3,
2 letter words:
ef5,
fe5,
pe4,
ee2,
er2,
re2,
