6 letter words:
rivers9,
5 letter words:
river8,
rives8,
siver8,
viers8,
vires8,
riser5,
4 letter words:
revs7,
rive7,
vier7,
vies7,
vise7,
errs4,
ires4,
reis4,
rise4,
sire4,
3 letter words:
rev6,
vie6,
vis6,
err3,
ers3,
ire3,
rei3,
res3,
sei3,
ser3,
sir3,
sri3,
2 letter words:
er2,
es2,
is2,
re2,
si2,