6 letter words:
backup16,
buckra14,
5 letter words:
aback13,
pucka13,
burka11,
kabar11,
parka11,
barca9,
4 letter words:
back12,
buck12,
pack12,
puck12,
bark10,
cark10,
kapa10,
kbar10,
park10,
rack10,
ruck10,
arak8,
burp8,
carb8,
carp8,
crab8,
crap8,
curb8,
paca8,
raku8,
bura6,
para6,
prau6,
aura4,
3 letter words:
kab9,
ark7,
auk7,
bap7,
cab7,
cap7,
cub7,
cup7,
pac7,
pub7,
aba5,
arb5,
arc5,
baa5,
bar5,
bra5,
bur5,
car5,
cru5,
cur5,
par5,
pur5,
rap5,
rub5,
urb5,
urp5,
2 letter words:
ka6,
ab4,
ba4,
pa4,
up4,
aa2,
ar2,