Rhyme
The haiku is too short to use rhymesRhyme
injures the reading with its too insistent repetition. In addition it is
an unwanted constraint upon lexical choice.
Rhythm
In certain languages, assonance, an internal chiming in the lines, is sought out. (I have changed your definition of assonance since in English at least assonance is not defined in terms of rhythm)Noise
The haiku is a form that appeals to the five senses. There are certain techniques to introduce the idea of sounds and noises.One
of the most famous haiku from Basho can be translated as :
| an
old pond
a frog jumping in sound of water but
also
|
|
| an
old pound
a frog jumping in splash -- |