6 letter words:
aucuba10,
5 letter words:
aback13,
babka13,
kabab13,
kibbi13,
bacca11,
cubic11,
abaci9,
4 letter words:
back12,
buck12,
abba8,
baba8,
babu8,
bubu8,
caca8,
3 letter words:
ick9,
kab9,
auk7,
bib7,
bub7,
cab7,
cub7,
aba5,
baa5,
2 letter words:
ka6,
ki6,
ab4,
ba4,
bi4,
aa2,
ai2,