Literary term 'Assonance' focus on the repetition of -

♦ Assonance:
- The Repetition of a vowel sound in nearby words (without the recurrence of consonant sounds which would make a rhyme) is called assonance.
- It is used for musical effect.

• An example of Assonance:
Alone, alone, all, all alone;
Alone on a wide, wide sea'

Source: An ABC of English Literature, Dr M Mofizar Rahman.