5 letter words:
neper7,
preen7,
4 letter words:
feen7,
feer7,
fere7,
fern7,
free7,
reef7,
neep6,
peen6,
peer6,
pene6,
pere6,
pern6,
pree6,
erne4,
reen4,
3 letter words:
eff9,
erf6,
fee6,
fen6,
fer6,
nef6,
ref6,
nep5,
pee5,
pen5,
per5,
pre5,
rep5,
een3,
ene3,
ere3,
ern3,
nee3,
ree3,
ren3,
2 letter words:
ef5,
fe5,
pe4,
ee2,
en2,
er2,
ne2,
re2,