8 letter words:
backpack24,
5 letter words:
pakka15,
aback13,
bacca11,
4 letter words:
back12,
kaka12,
pack12,
kapa10,
abac8,
acca8,
caba8,
caca8,
capa8,
paca8,
3 letter words:
kak11,
kab9,
aka7,
bac7,
bap7,
cab7,
cap7,
pac7,
aba5,
baa5,
caa5,
2 letter words:
ka6,
ab4,
ba4,
pa4,
aa2,