In obsolete terms the difference between discourse and chapter
is that
discourse is dealing; transaction while
chapter is a location or compartment.
As nouns the difference between discourse and chapter
is that
discourse is verbal exchange, conversation while
chapter is one of the main sections into which the text of a book is divided.
As verbs the difference between discourse and chapter
is that
discourse is to engage in discussion or conversation; to converse while
chapter is to divide into chapters.