Here's a breakdown:
* Prepared speech: This emphasizes the fact that the speech is planned and written out beforehand.
* Formal address: This highlights the occasion's seriousness and the speaker's authority.
* Public address: This focuses on the intended audience and the public setting of the speech.
* Oration: This is a more literary term, emphasizing the eloquence and artistic nature of the speech.
The specific term used often depends on the context and the particular style of the speech.