9 letter words:
efference17,
7 letter words:
refence12,
6 letter words:
effere12,
fencer11,
enfree9,
5 letter words:
fence10,
cerne7,
4 letter words:
feen7,
feer7,
fere7,
fern7,
free7,
reef7,
cere6,
cree6,
erne4,
reen4,
3 letter words:
eff9,
erf6,
fee6,
fen6,
fer6,
nef6,
ref6,
cee5,
rec5,
een3,
ene3,
ere3,
ern3,
nee3,
ree3,
ren3,
2 letter words:
ef5,
fe5,
ee2,
en2,
er2,
ne2,
re2,