What is a sermon? Is it different from a lecture or a talk?

What is a sermon? Is it different from a lecture or a talk?

Can this word also be used in a negative way or as a joke (as in “my mother’s sermon about getting my work done on time…”)?
Answer: Sermon is mainly a talk or a speech given by a priest on religious or moral subject. It is totally different from a lecture or a talk. No, this word can’t be used in a negative way or as a joke.