4 letter words:
carb8,
crab8,
curb8,
bard7,
baud7,
brad7,
burd7,
card7,
crud7,
curd7,
darb7,
daub7,
drab7,
drub7,
bura6,
dura5,
3 letter words:
cab7,
cub7,
bad6,
bud6,
cad6,
cud6,
dab6,
dub6,
arb5,
arc5,
bar5,
bra5,
bur5,
car5,
cru5,
cur5,
rub5,
urb5,
rad4,
urd4,
2 letter words:
ab4,
ba4,
ad3,
ar2,