Orates means to speak formally or at length on a particular topic. Synonyms for orates include lecture, discourse, address, speak, pontificate, preach, declaim, expatiate, sermonize, and harangue. Lecture refers to a formal presentation of information on a particular topic, while discourse refers to a detailed discussion of a subject. An address is a formal speech given in a specific setting, like a graduation ceremony or political event. Pontificate suggests a self-righteous or arrogant tone, while preaching involves conveying a moral message in a sermon. Declaim refers to speaking dramatically, while expatiate means to speak at length with freedom and detail. Sermonize implies a didactic or moralizing tone, and harangue suggests a passionate but aggressive speech.