Which word best describes language that differs from literary speech?

The term that best describes language that differs from literary speech is colloquial. Colloquial language refers to the informal, everyday speech that people use in casual conversations. It often includes regional expressions, slang, and expressions that might not be appropriate in formal writing or literary contexts. This kind of language captures the natural rhythms of speech and conveys personality and cultural identity, making it distinct from the more polished, structured nature of literary speech.

The other words do not align with the concept of language style. Coagulation refers to the process of a liquid turning into a solid, which is unrelated to language. Circuitous means roundabout or indirect, typically referring to physical routes or methods rather than speech. Clamor refers to a loud and confused noise, often generated by a crowd, and does not pertain to the differences in language styles. Therefore, colloquial is indeed the most fitting choice for this question.