5 letter words:
beret7,
brute7,
buret7,
rebut7,
tuber7,
4 letter words:
beer6,
beet6,
bere6,
bete6,
bree6,
brut6,
bute6,
rube6,
tube6,
rete4,
teer4,
tree4,
true4,
3 letter words:
bee5,
bet5,
bru5,
bur5,
but5,
reb5,
rub5,
tub5,
urb5,
ere3,
ree3,
ret3,
rue3,
rut3,
tee3,
ure3,
ute3,
utu3,
2 letter words:
be4,
ee2,
er2,
et2,
re2,
te2,
ur2,
ut2,