Walt Whitman uses Alliteration, Anaphora, Imagery, and Onomatopoeia. In Whitman's Poem "O Captain, My Captain" he uses a lot of internal rhyme, caesura, anaphora, alliteration, and repetition to emphasize certain phrases and their meaning. At the beginning of the first and second stanzas, Whitman starts with "O Captain, My Captain" and at the end of every stanza uses either "You've fallen cold and dead or Fallen cold and dead" showing his use of Anaphora. In the same poem, he uses a lot of repetition, "But O heart! heart! heart".