Letter, notice, profile, conversation, etc. are examples of "written" and "spoken" language discourses.
These terms refer to different types of communication or forms of discourse, which can be categorized into written and spoken language. For example:
Letter and notice are examples of written discourses.
Profile can be written (like in social media or a biography) or spoken.
Conversation is an example of spoken discourse.
Each of these forms has its own structure and style of communication, tailored to the medium of communication (written or spoken).