7 letter words:
fronton10,
5 letter words:
front8,
roton5,
4 letter words:
font7,
foot7,
fort7,
roof7,
noon4,
onto4,
oont4,
ront4,
roon4,
root4,
roto4,
toon4,
torn4,
toro4,
tron4,
3 letter words:
fon6,
for6,
fro6,
oft6,
oof6,
orf6,
non3,
noo3,
nor3,
not3,
ono3,
oon3,
oor3,
oot3,
ort3,
roo3,
rot3,
ton3,
too3,
tor3,
2 letter words:
of5,
no2,
on2,
oo2,
or2,
to2,