6 letter words:
funner9,
unfree9,
penner8,
punner8,
5 letter words:
penne7,
preen7,
prune7,
puree7,
rupee7,
unpen7,
enure5,
4 letter words:
enuf7,
fere7,
fern7,
free7,
reef7,
neep6,
peen6,
peer6,
pere6,
pree6,
pure6,
erne4,
nene4,
rune4,
3 letter words:
fee6,
fen6,
fer6,
feu6,
fun6,
fur6,
ref6,
pee5,
pen5,
per5,
pun5,
pur5,
rep5,
urp5,
ere3,
ern3,
nee3,
nun3,
ree3,
rue3,
run3,
urn3,
2 letter words:
ef5,
fe5,
pe4,
up4,
en2,
er2,
ne2,
nu2,
re2,
un2,