5 letter words:
preen7,
4 letter words:
fere7,
fern7,
free7,
reef7,
neep6,
peen6,
peer6,
pere6,
pree6,
erne4,
3 letter words:
eff9,
fee6,
fen6,
fer6,
ref6,
pee5,
pen5,
per5,
rep5,
ere3,
ern3,
nee3,
ree3,
2 letter words:
ef5,
fe5,
pe4,
en2,
er2,
ne2,
re2,