* Internal rhyme: This is the closest synonym, referring to the repetition of vowel sounds within a line of poetry.
* Vowel rhyme: This emphasizes the focus on vowel sounds.
* Vocalic rhyme: Another way to highlight the importance of vowel sounds.
* Sound repetition: This is a broader term that encompasses both assonance and consonance.
* Alliteration: While this refers to the repetition of consonant sounds, it is similar in concept.
* Euphony: This refers to the pleasing sound of words, which assonance often contributes to.
The best synonym for you will depend on the specific context.