Which term refers to a phrase that combines contradictory terms for effect?

The term that refers to a phrase combining contradictory terms for effect is known as an oxymoron. Oxymorons are often used in literature and everyday speech to create a striking or thought-provoking effect, illustrating a complex or nuanced idea by juxtaposing contrasting concepts. Classic examples include phrases like "deafening silence" or "bittersweet."

By pairing opposing ideas, oxymorons encourage readers or listeners to think more deeply about the meanings behind the words, often highlighting the complexity of emotions or situations. They can evoke humor, irony, or a deeper understanding of a subject, making this literary device a powerful tool in both poetry and prose.

In contrast, a metaphor involves comparing two unrelated things without using "like" or "as," synecdoche refers to a figure of speech in which a part represents the whole or vice versa, and hyperbole is an exaggerated statement not meant to be taken literally. Each of these has its distinct purpose and effect, separate from the nuanced impact that an oxymoron can create.