General terms:
* Address: This is a common and versatile term for a formal speech.
* Oration: This emphasizes the eloquence and formality of the speech.
* Lecture: This suggests a more academic or instructional tone.
* Discourse: This implies a more reasoned and extended discussion.
* Keynote: This is a speech delivered at the start of an event.
More specific terms:
* Eulogy: A speech delivered in praise of someone who has died.
* Inaugural Address: A speech given at the beginning of a term of office.
* Commencement Address: A speech given at a graduation ceremony.
* Acceptance Speech: A speech given after receiving an award.
Informal terms:
* Talk: This is a more casual term for a speech.
* Presentation: This is often used for a more visual and interactive speech.
* Keynote Address: This is a speech that sets the tone for a conference or event.
The best word to use will depend on the specific context of the speech.