7 letter words:
inferno10,
6 letter words:
orpine8,
pernio8,
pinner8,
5 letter words:
finer8,
infer8,
opine7,
orpin7,
penni7,
pinon7,
prion7,
prone7,
repin7,
ripen7,
inner5,
irone5,
renin5,
4 letter words:
prof9,
fern7,
fine7,
fino7,
fire7,
firn7,
foin7,
fore7,
froe7,
info7,
neif7,
reif7,
rife7,
nope6,
open6,
pein6,
peon6,
peri6,
pier6,
pine6,
pion6,
pirn6,
pone6,
pore6,
porn6,
repo6,
ripe6,
rope6,
inro4,
iron4,
neon4,
nine4,
noir4,
none4,
nori4,
rein4,
3 letter words:
fop8,
fen6,
fer6,
fie6,
fin6,
fir6,
foe6,
fon6,
for6,
fro6,
ref6,
rif6,
nip5,
ope5,
pen5,
per5,
pie5,
pin5,
poi5,
pro5,
rep5,
rip5,
eon3,
ern3,
inn3,
ion3,
ire3,
nor3,
one3,
ore3,
rei3,
rin3,
roe3,
2 letter words:
ef5,
fe5,
if5,
of5,
op4,
pe4,
pi4,
en2,
er2,
in2,
ne2,
no2,
oe2,
oi2,
on2,
or2,
re2,