What is the exact definition of the literary device assonance?
This web site Literary Devices explains it as:
Assonance takes place when two or more words, close to one another repeat the same vowel sound, but start with different consonant sounds.
“Men sell the wedding bells.”
The site says that the assonant words should begin with different consonants.
As per this definition, I think, this line 'I have no rest, nor joy, nor peace' (W B Yeats) is not an example of assonance. Am I right?