Formal:
* Delivering a speech: This is the most general and neutral term.
* Presenting a speech: This implies a more structured and prepared format.
* Orating: This is a more formal and literary term, often used for speeches that are highly eloquent or persuasive.
Informal:
* Talking: This is a casual and everyday term.
* Giving a talk: This is a less formal term than delivering a speech, often used for shorter presentations.
* Speaking: This is a general term that can be used in both formal and informal contexts.
Other terms:
* Address: This is a term used for formal speeches, often given to a large audience.
* Lecture: This is a term used for speeches that are informative and educational.
* Keynote address: This is a term used for a major speech delivered at the beginning of a conference or event.
The best term to use will depend on the specific situation.