7 letter words:
repiner9,
ripener9,
unriper9,
6 letter words:
pruner8,
punier8,
purine8,
repine8,
unripe8,
ruiner6,
5 letter words:
preen7,
prier7,
prune7,
puree7,
purer7,
purin7,
repin7,
ripen7,
riper7,
rupee7,
unrip7,
enure5,
inure5,
rerun5,
urine5,
4 letter words:
neep6,
peen6,
peer6,
pein6,
pere6,
peri6,
pier6,
pine6,
pirn6,
pree6,
pure6,
puri6,
purr6,
ripe6,
erne4,
rein4,
ruer4,
ruin4,
rune4,
3 letter words:
nip5,
pee5,
pen5,
per5,
pie5,
pin5,
piu5,
pun5,
pur5,
rep5,
rip5,
urp5,
ere3,
ern3,
err3,
ire3,
nee3,
ree3,
rei3,
rin3,
rue3,
run3,
urn3,
2 letter words:
pe4,
pi4,
up4,
en2,
er2,
in2,
ne2,
nu2,
re2,
un2,