Alliteration

the use of the same sound or sounds, especially consonants, at the beginning of several words that are close together:

Example:

Round the rugged rocks the ragged rascal ran

Paula planted the pretty pink poppies in the pot.

Bake a big cake with lots of butter and bring it to the birthday bash.

Garry grumpily gathered the garbage.

is the repetition of the same or similar vowel sounds within words, phrases, or sentences.

Example:

 Sally sells sea shells beside the sea shore