6 letter words:
plonks12,
5 letter words:
knops11,
knosp11,
plonk11,
4 letter words:
knop10,
kops10,
lops6,
pols6,
pons6,
slop6,
3 letter words:
kop9,
kos7,
lop5,
ops5,
pol5,
sop5,
nos3,
ons3,
sol3,
son3,
2 letter words:
op4,
lo2,
no2,
on2,
os2,
so2,