Basic text and Exordium

Exordium and basic text are semantically related in introduction topic. In some cases you can use "Exordium" instead a noun phrase "Basic text", when it comes to topics like something new.

Exordium noun - A short section (as of a book) that leads to or explains the main part.

Basic text and exordium are semantically related in introduction topic. Sometimes you can use "Basic text" instead a noun "Exordium", if it concerns topics such as something new.