"Full Fathom Five" uses alliteration and onomatopoeia. "Full fathom five thy father lies," is an example of alliteration from the poem, and "Ding-Dong" is an example of onomatopoeia.
Alliteration is the redundancy of a similar sound a the start of a gathering of words. A case of this is the main line: "Full comprehend five thy father lies".
Onomatopoeia refers to a word that sounds equivalent to it's meaning. A case of this is "Ding-Dong."
