what occurs when several words that are close together all begin with the same consonant sound.

This is called alliteration. Alliteration is a literary device where consecutive or closely positioned words in a sentence or phrase begin with the same consonant sound. The repeated consonant sound creates a pleasing rhythm and can help to emphasize certain words or ideas. Alliteration is commonly used in poetry, literature, advertising, and slogans to add emphasis, create mood, or enhance the overall tone of the writing.