The poetic elements you're describing are:
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Alliteration: This refers to the repetition of the same sound at the beginning of two or more words close to each other in a line or short section. For example, "She sells sea shells by the sea shore."
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Consonance: This describes the repetition of the same consonant sound appearing anywhere in several words in a line or section of text, not just at the beginning. For example, in the phrase "pitter-patter," the "t" and "r" sounds are examples of consonance.
These elements enhance the musical quality of poetry and contribute to its overall rhythm and texture.