7 letter words:
burette9,
6 letter words:
burpee10,
better8,
butter8,
petter8,
puttee8,
putter8,
repute8,
5 letter words:
upper9,
beret7,
brute7,
buret7,
butte7,
erupt7,
peter7,
petre7,
puree7,
rebut7,
rupee7,
tuber7,
upter7,
tutee5,
utter5,
4 letter words:
beep8,
burp8,
peep8,
perp8,
prep8,
pube8,
repp8,
beer6,
beet6,
bere6,
bete6,
bree6,
brut6,
bute6,
butt6,
peer6,
pere6,
pert6,
pree6,
puer6,
pure6,
putt6,
rube6,
tube6,
rete4,
teer4,
tete4,
tree4,
tret4,
true4,
3 letter words:
pep7,
pub7,
pup7,
bee5,
bet5,
bru5,
bur5,
but5,
pee5,
per5,
pet5,
pre5,
pur5,
put5,
reb5,
rep5,
rub5,
tub5,
tup5,
urb5,
urp5,
ere3,
ree3,
ret3,
rue3,
rut3,
tee3,
tet3,
tut3,
ure3,
ute3,
2 letter words:
be4,
pe4,
up4,
ee2,
er2,
et2,
re2,
te2,
ur2,
ut2,