6 letter words:
unroof9,
5 letter words:
korun9,
kroon9,
4 letter words:
zonk17,
zouk17,
zurf16,
orzo13,
ouzo13,
zoon13,
fork11,
funk11,
knur8,
koro8,
koru8,
nook8,
nork8,
rook8,
four7,
roof7,
ourn4,
roon4,
3 letter words:
zoo12,
kon7,
kor7,
ouk7,
rok7,
fon6,
for6,
fou6,
fro6,
fun6,
fur6,
oof6,
orf6,
ufo6,
noo3,
nor3,
nur3,
ono3,
oon3,
oor3,
our3,
roo3,
run3,
urn3,
2 letter words:
zo11,
ko6,
of5,
no2,
nu2,
on2,
oo2,
or2,
ou2,
un2,
ur2,