5 letter words:
viper10,
riven8,
repin7,
ripen7,
4 letter words:
perv9,
nevi7,
rive7,
vein7,
vier7,
vine7,
pein6,
peri6,
pier6,
pine6,
pirn6,
ripe6,
rein4,
3 letter words:
rev6,
vie6,
nip5,
pen5,
per5,
pie5,
pin5,
rep5,
rip5,
ern3,
ire3,
rei3,
rin3,
2 letter words:
pe4,
pi4,
en2,
er2,
in2,
ne2,
re2,