7 letter words:
beerier9,
retiree7,
6 letter words:
eerier6,
retire6,
5 letter words:
beret7,
biter7,
brier7,
tribe7,
eerie5,
retie5,
trier5,
4 letter words:
beer6,
beet6,
bier6,
birr6,
bite6,
bree6,
brie6,
brit6,
rete4,
rite4,
tier4,
tire4,
tree4,
3 letter words:
bee5,
bet5,
bit5,
brr5,
reb5,
rib5,
ere3,
err3,
ire3,
ree3,
rei3,
ret3,
tee3,
tie3,
2 letter words:
be4,
bi4,
er2,
et2,
it2,
re2,
ti2,