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 ‘candy’ and ‘Cindy’ do not alliterate, but ‘cool’ and ‘kids’ do.
definition from http://www.nanascorner.com/alliteration-examples-kid-alliteration-poems-tongue-twisters-cliches/