9 letter words:
pronghorn15,
6 letter words:
gonoph12,
phonon11,
5 letter words:
phono10,
honor8,
prong8,
porno7,
4 letter words:
hoop9,
phon9,
pooh9,
hong8,
goop7,
gorp7,
horn7,
pong7,
prog7,
poon6,
poor6,
porn6,
goon5,
noon4,
3 letter words:
hop8,
poh8,
hog7,
hon6,
noh6,
oho6,
ooh6,
rho6,
poo5,
pro5,
goo4,
gor4,
nog4,
noo3,
nor3,
ono3,
2 letter words:
ho5,
oh5,
op4,
go3,
no2,
on2,
or2,