9 letter words:
provision14,
7 letter words:
proviso12,
virions10,
6 letter words:
virion9,
vision9,
orpins8,
poison8,
pooris8,
pornos8,
prions8,
prison8,
spinor8,
orison6,
5 letter words:
vinos8,
visor8,
opsin7,
orpin7,
pions7,
pirns7,
poons7,
poori7,
porno7,
porns7,
prion7,
proso7,
snoop7,
sopor7,
spoon7,
spoor7,
irons5,
noirs5,
noris5,
ornis5,
rosin5,
4 letter words:
spiv9,
vino7,
nips6,
oops6,
pins6,
pion6,
pirn6,
piso6,
pois6,
pons6,
poon6,
poor6,
poos6,
porn6,
pros6,
rips6,
snip6,
spin6,
inro4,
ions4,
iris4,
iron4,
nisi4,
noir4,
nori4,
onos4,
rins4,
soon4,
sori4,
sorn4,
3 letter words:
vis6,
nip5,
ops5,
pin5,
pis5,
poi5,
poo5,
pro5,
psi5,
rip5,
sip5,
sop5,
ins3,
ion3,
noo3,
nor3,
nos3,
ono3,
ons3,
ors3,
rin3,
sin3,
sir3,
son3,
sri3,
2 letter words:
op4,
pi4,
in2,
is2,
no2,
oi2,
on2,
or2,
os2,
si2,
so2,