7 letter words:
upriver12,
5 letter words:
viper10,
river8,
prier7,
purer7,
riper7,
4 letter words:
perv9,
rive7,
vier7,
peri6,
pier6,
pure6,
puri6,
purr6,
ripe6,
ruer4,
3 letter words:
rev6,
vie6,
per5,
pie5,
piu5,
pur5,
rep5,
rip5,
urp5,
err3,
ire3,
rei3,
rue3,
2 letter words:
pe4,
pi4,
up4,
er2,
re2,
