Poetic Device in "The water plopped into lake big droplets": Alliteration

The line uses alliteration—repetition of the initial /p/ sound in "plopped," "into" (wait—"into" starts with a vowel), and "plopped" (repeated). Actually, the /p/ sound appears in "plopped" (twice) and "droplets" (medial /p/), creating a percussive, dripping rhythm that mimics the sound of water hitting water.

Note: The original analysis incorrectly cited "into" as a /p/ word; the alliteration rests on "plopped" (×2) and "droplets."