alliteration

2. The repeated use of the same letter at the start of nearby words in a poem or slogan.

The brand name 'Coca-Cola' uses alliteration.

3. A style of writing that repeats initial sounds to make phrases catchy or memorable.

Many nursery rhymes rely on alliteration to stick in children's minds.

4. The act of repeating a sound at the beginning of words for a special effect in speech.

His speech was full of alliteration, like 'proud, passionate, and purposeful.'