The term POETRY'S COUNTERPART can be solved by the crossword solution PROSE, which is a five-letter word. PROSE is a form of language that has no formal metrical structure and is often used in writing to express ordinary language in a straightforward, clear manner. It is the opposite of poetry, which is a form of language that uses rhythm, meter, and other sound patterns to create a desired effect. PROSE is commonly used in novels, short stories, essays, and other forms of literature.