Here's why:
* Onomatopoeia is the formation of a word from a sound associated with what it describes. "Achoo" directly imitates the sound of a sneeze.
Let's look at the other options:
* Alliteration is the repetition of consonant sounds at the beginning of words (e.g., "Peter Piper picked a peck of pickled peppers"). "Achoo" doesn't have repeating consonant sounds.
* Lyrical refers to something poetic or song-like. While "achoo" might be used in a song, it's not inherently lyrical.
* Elliptic means omitting something that is understood, often used in grammar. "Achoo" isn't missing any parts of a sentence or phrase.