1. allegory: a literary work that has a second meaning beneath the surface, often relating to a fixed, corresponding idea or moral principle.
2. alliteration: repetition of initial consonant sounds. It serves to please the ear and bind verses together, to make lines more memorable, and for humorous effect.
• Already American vessels had been searched, seized, and sunk. -John F. Kennedy
• I should like to hear him fly with the high fields/ And wake to the farm forever fled from the childless