Alliteration is the use of the same consonant sounds in words that are near each other. It is the sound, not the letter, that is important: therefore ‘city’ and ‘code’ do not alliterate, but ‘kitchen’ and ‘code’ do. The Poetry Archive
Adynaton is from a Greek word adunaton, which means impractical or impossible. It is a rhetorical device that is a form of hyperbole in which exaggeration is taken to a great extreme where it seems impossible. (literarydevices.net)
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