6 letter words:
frenne9,
funner9,
unfree9,
penner8,
punner8,
5 letter words:
neper7,
penne7,
preen7,
prune7,
puree7,
rupee7,
unpen7,
enure5,
renne5,
4 letter words:
enuf7,
feen7,
feer7,
fere7,
fern7,
free7,
reef7,
neep6,
peen6,
peer6,
pene6,
pere6,
pern6,
pree6,
puer6,
pure6,
erne4,
nene4,
reen4,
rune4,
3 letter words:
erf6,
fee6,
fen6,
fer6,
feu6,
fun6,
fur6,
nef6,
ref6,
nep5,
pee5,
pen5,
per5,
pre5,
pun5,
pur5,
rep5,
urp5,
een3,
ene3,
ere3,
ern3,
nee3,
nun3,
nur3,
ree3,
ren3,
rue3,
run3,
ure3,
urn3,
2 letter words:
ef5,
fe5,
pe4,
up4,
ee2,
en2,
er2,
ne2,
nu2,
re2,
un2,
ur2,