6 letter words:
etrier6,
reiter6,
retire6,
5 letter words:
retie5,
trier5,
4 letter words:
rete4,
rite4,
teer4,
tier4,
tire4,
tirr4,
tree4,
trie4,
3 letter words:
ere3,
err3,
ire3,
ree3,
rei3,
ret3,
rit3,
tee3,
tie3,
2 letter words:
ee2,
er2,
et2,
it2,
re2,
te2,
ti2,