1. Alliteration: This is the most common term for this technique, where words in close proximity begin with the same consonant sound. It's often used for emphasis and to create a memorable effect.
2. Acrostic: This is a specific type of poem where the first letter of each line spells out a word or phrase.
3. Anaphora: This is a rhetorical device where the same word or phrase is repeated at the beginning of successive clauses or sentences.
4. Assonance: This involves the repetition of vowel sounds, not necessarily at the start of words.
While these terms don't fully capture the concept of words starting with the same alphabet, they describe similar techniques that use repetition and sound devices to create impact in poetry.
If you're looking for poems that use this specific technique, you might want to search for poems that use "repetition" or "sound devices" as keywords.