5 letter words:
purer7,
4 letter words:
burp8,
burr6,
pure6,
purr6,
rube6,
ruer4,
3 letter words:
fub8,
pub7,
fer6,
feu6,
fur6,
ref6,
brr5,
bur5,
per5,
pur5,
reb5,
rep5,
rub5,
urb5,
urp5,
err3,
rue3,
2 letter words:
ef5,
fe5,
be4,
pe4,
up4,
er2,
re2,