Alliteration
Alliteration is the repetition of the same sounds or of the same kinds of sounds at the beginning of words or in stressed syllables of a phrase. Alliteration developed largely through poetry, in which it more narrowly refers to the repetition of a consonant in any syllables that, according to the poem's meter, are stressed, as in James Thomson's verse "Come…dragging the
lazy
languid
Line a
long". Another example is, "Peter Piper Picked a Peck of Pickled Peppers".
Consonance is another 'phonetic agreement' akin to alliteration. It refers to the repetition of consonant sounds. Alliteration is a special case of consonance where the repeated consonant sound is at the stressed syllable. Alliteration may also include the use of different consonants with similar properties such as alliterating
z with
s, as does Tolkien in Sir Gawain and the Green Knight, or as Anglo-Saxon poets would alliterate hard/fricative
g with soft
g; this is known as
license. There is one specialised form of alliteration called
Symmetrical Alliteration. That is, alliteration containing parallelism.