5 letter words:
fubar10,
4 letter words:
barf9,
frab9,
frap9,
bapu8,
barp8,
burp8,
faur7,
frau7,
baur6,
bura6,
prau6,
3 letter words:
fab8,
fap8,
fub8,
bap7,
pub7,
arf6,
auf6,
far6,
fra6,
fur6,
arb5,
bar5,
bra5,
bru5,
bur5,
par5,
pur5,
rap5,
rub5,
urb5,
urp5,
2 letter words:
fa5,
ab4,
ba4,
pa4,
up4,
ar2,
ur2,