Assonance

Definition: the effect created when two syllables in words 
that are close together have the same vowel sound, 
but  different consonants, or the same consonants but different vowels, 
for example, sonnet and porridge or cold and killed


Example: “Poetry is old, ancient, goes back far. 
It is among the oldest of living things. 
So old it is that no man knows how and 
why the first poems came.”


Significant: Assonance is used to reinforce the meanings of words or to set the mood.