For emphasis and impact:
* Alliteration: Repetition of consonant sounds at the beginning of words ("Silent, still, sleepy"). Creates a sense of urgency, focus, or even a rhythmic quality.
* Assonance: Repetition of vowel sounds ("The outgoing office ordered outsourced operations"). Adds a melodic quality, creates a calming effect, or highlights a specific emotion.
* Consonance: Repetition of consonant sounds within words ("The soft sun set slipped silently south"). Creates a sense of tension, suspense, or a somber atmosphere.
For a specific tone:
* Onomatopoeia: Words that sound like the noise they represent ("The crash of the falling tree echoed in the roar of the storm"). Adds vivid imagery and makes the writing more impactful.
* Rhyme: Words that sound alike ("The night was bright, the stars were white"). Creates a memorable effect, often used for humor, poetry, or songs.
Beyond sound devices:
* Repetition: Repeating words, phrases, or even entire sentences. Drives home a point by making it memorable and unforgettable.
* Parallelism: Using similar grammatical structures to create a sense of balance and emphasis. ("I came, I saw, I conquered.").
Ultimately, the best sound device to use depends on the author's intentions and the overall context of the writing. Choose the device that will best enhance the desired effect and make the point stand out!