5 letter words:
barca9,
4 letter words:
abba8,
baba8,
babu8,
barb8,
burb8,
carb8,
crab8,
curb8,
bura6,
aura4,
3 letter words:
bub7,
cab7,
cub7,
aba5,
arb5,
arc5,
baa5,
bar5,
bra5,
bur5,
car5,
cru5,
cur5,
rub5,
urb5,
2 letter words:
ab4,
ba4,
aa2,
ar2,