6 letter words:
either9,
hereto9,
heriot9,
hetero9,
5 letter words:
ether8,
hiree8,
ither8,
other8,
their8,
there8,
three8,
throe8,
retie5,
4 letter words:
heir7,
here7,
hero7,
hire7,
hoer7,
thee7,
thio7,
thir7,
thro7,
rete4,
riot4,
rite4,
rote4,
roti4,
tier4,
tire4,
tiro4,
tore4,
tori4,
tree4,
trio4,
3 letter words:
eth6,
her6,
het6,
hie6,
hit6,
hoe6,
hot6,
rho6,
the6,
tho6,
ere3,
ire3,
ore3,
ort3,
ree3,
rei3,
ret3,
roe3,
rot3,
tee3,
tie3,
toe3,
tor3,
2 letter words:
eh5,
he5,
hi5,
ho5,
oh5,
er2,
et2,
it2,
oe2,
oi2,
or2,
re2,
ti2,
to2,