9 letter words:
protozoon20,
6 letter words:
pronto8,
proton8,
5 letter words:
trooz14,
porno7,
troop7,
4 letter words:
orzo13,
zoon13,
prow9,
nowt7,
town7,
trow7,
wont7,
worn7,
wort7,
poon6,
poor6,
porn6,
port6,
topo6,
trop6,
onto4,
root4,
roto4,
toon4,
torn4,
toro4,
3 letter words:
zoo12,
pow8,
wop8,
now6,
own6,
row6,
tow6,
two6,
won6,
woo6,
wot6,
opt5,
poo5,
pot5,
pro5,
top5,
noo3,
nor3,
not3,
ono3,
oot3,
ort3,
rot3,
ton3,
too3,
tor3,
2 letter words:
ow5,
wo5,
op4,
no2,
on2,
or2,
to2,