9 letter words:
forpining15,
8 letter words:
proining11,
7 letter words:
foining11,
opining10,
pioning10,
ironing8,
roining8,
6 letter words:
fripon11,
fining10,
firing10,
froing10,
fiorin9,
pining9,
pirogi9,
poring9,
proign9,
riping9,
roping9,
pinion8,
origin7,
5 letter words:
gonif9,
gipon8,
oping8,
piing8,
pingo8,
pirog8,
prong8,
orpin7,
pinon7,
prion7,
proin7,
giron6,
groin6,
iring6,
inion5,
ronin5,
4 letter words:
prof9,
figo8,
frig8,
frog8,
fini7,
fino7,
firn7,
foin7,
gorp7,
grip7,
info7,
ping7,
pong7,
prig7,
prog7,
pion6,
pirn6,
porn6,
ginn5,
girn5,
giro5,
gori5,
grin5,
ingo5,
nong5,
ring5,
rong5,
inro4,
iron4,
noir4,
noni4,
nori4,
roin4,
3 letter words:
fop8,
fig7,
fog7,
gif7,
fin6,
fir6,
fon6,
for6,
fro6,
gip6,
orf6,
pig6,
rif6,
nip5,
pin5,
pir5,
poi5,
pro5,
rip5,
gin4,
gio4,
gon4,
gor4,
nog4,
rig4,
inn3,
ion3,
non3,
nor3,
rin3,
2 letter words:
if5,
of5,
op4,
pi4,
po4,
gi3,
go3,
in2,
io2,
no2,
oi2,
on2,
or2,