5 letter words:
frock14,
4 letter words:
firk11,
fork11,
cork10,
rick10,
rock10,
coif9,
corf9,
fico9,
foci9,
coir6,
3 letter words:
kif10,
ick9,
irk7,
kir7,
koi7,
kor7,
oik7,
rok7,
fir6,
for6,
fro6,
orf6,
rif6,
cor5,
orc5,
roc5,
2 letter words:
ki6,
ko6,
if5,
of5,
io2,
oi2,
or2,