thief - teeth - fifth
thumb - dumb
three – tree - free
they – day
birth - bird
thorn - torn
dough – toe - though
there – dare – tear
with - wit - weed
thin – tin – fin
then - den - fan
thought – taught – dot
Thor - four - tore - door
thigh – tie – die
thirst - first
mouths - months - moths
thirty - dirty
thick – tick
thank - tank
letter - leather