5 letter words:
fubar10,
barra7,
aurar5,
4 letter words:
barf9,
frab9,
afar7,
faur7,
frau7,
furr7,
arba6,
baur6,
bura6,
burr6,
arar4,
aura4,
3 letter words:
fab8,
fub8,
arf6,
auf6,
faa6,
far6,
fra6,
fur6,
aba5,
arb5,
baa5,
bar5,
bra5,
brr5,
bru5,
bur5,
rub5,
urb5,
aua3,
2 letter words:
fa5,
ab4,
ba4,
aa2,
ar2,
ur2,