7 letter words:
perturb11,
rupture9,
6 letter words:
fureur9,
future9,
returf9,
bruter8,
puture8,
5 letter words:
brute7,
buret7,
erupt7,
purer7,
rebut7,
tuber7,
upter7,
truer5,
4 letter words:
burp8,
pube8,
fret7,
furr7,
reft7,
terf7,
tref7,
turf7,
brer6,
brut6,
burr6,
bute6,
pert6,
puer6,
pure6,
purr6,
rube6,
rurp6,
tube6,
ruer4,
ruru4,
true4,
3 letter words:
fub8,
pub7,
eft6,
erf6,
fer6,
fet6,
feu6,
fur6,
ref6,
tef6,
bet5,
brr5,
bru5,
bur5,
but5,
per5,
pet5,
pre5,
pur5,
put5,
reb5,
rep5,
rub5,
tub5,
tup5,
urb5,
urp5,
err3,
ret3,
rue3,
rut3,
ure3,
ute3,
utu3,
2 letter words:
ef5,
fe5,
be4,
pe4,
up4,
er2,
et2,
re2,
te2,
ur2,
ut2,