The repetition is Shel Silversteins' "Nobody" is the word nobody, he constantly uses it more than once
First you are nobody, then when somebody comes along and loves you, you in turn, become Somebody
A repetition poem is a poem that repeats a syllable, accent, sound, etc. It can be a word, a sentence, or a phrase. It is a poetic device that creates expectation and rhythm.
When a word or phrase is used over and over again.
A really good site:http://shelsilverstein.yolasite.com/Has a booklist and you can read a bunch of his poems.Hope this helps.
the type of poems he writes are funny , silly , sad and happy poems