The Definitions (From Mark Dever)
Anecdotal - a sermon in which the preacher primarily tells engaging stories with a moral lesson.
Biographical - a sermon in which the preacher traces the life of a biblical character and draws contemporary moral implications.
Topical - a sermon that has a topic in mind prior to consulting the text, and then searches for one or more biblical texts that address the topic chosen beforehand.
Textual - a sermon that refers often to a particular Biblical text, but does not take the main point of the text as its own.
Expositional - a sermon which takes the point of the text as the point of the sermon