Abstract
By using library research, the present paper studies the signification and function of the structural elements and characteristics of words, as the most effective factors in the word choice of poetry. Every word has two important functions in poetry. On the one hand, the form of poetry is based on words. On the other hand, it is the tool for transferring the meaning of poetry. The phonetic aspect of the word alone produces two effects for poetry: 1- reinforcing the music of poetry formed by alliteration, pun, and other musical beauties that are the result of phonemes and phonetic clusters repetition and 2- inducing meaning through phonemes. In addition, from the semantic point of view, words have important effects on poetry, because of their three kinds of meaning: implicit, explicit and figurative.