12 letter words:
pogonophoran20,
7 letter words:
harpoon12,
nonpoor9,
organon8,
6 letter words:
gonoph12,
hoopoo11,
orphan11,
phonon11,
nonpar8,
5 letter words:
graph11,
phono10,
hogan9,
honan8,
honor8,
pargo8,
prang8,
prong8,
apron7,
porno7,
argon6,
groan6,
orang6,
organ6,
4 letter words:
harp9,
hoop9,
opah9,
phon9,
pooh9,
hang8,
hong8,
poop8,
prop8,
goop7,
gorp7,
hoar7,
hora7,
horn7,
pang7,
pong7,
prog7,
poon6,
poor6,
porn6,
prao6,
proa6,
agon5,
gnar5,
goon5,
gran5,
rang5,
anon4,
nona4,
noon4,
roan4,
3 letter words:
hap8,
hop8,
pah8,
poh8,
app7,
hag7,
hog7,
pap7,
pop7,
gap6,
hao6,
hon6,
nah6,
noh6,
oho6,
ooh6,
rah6,
rho6,
apo5,
nap5,
pan5,
par5,
poo5,
pro5,
rap5,
ago4,
gan4,
gar4,
goa4,
goo4,
gor4,
nag4,
nog4,
rag4,
nan3,
noo3,
nor3,
oar3,
ono3,
ora3,
ran3,
2 letter words:
ah5,
ha5,
ho5,
oh5,
op4,
pa4,
ag3,
go3,
an2,
ar2,
na2,
no2,
on2,
or2,