discuss vs discourse

discuss is not a noun while discourse is a noun.

Word	Noun	Adjective	Verb	Adverb
discuss	No	No	Yes	No
discourse	Yes	No	Yes	No

As verbs, discuss and discourse are synonyms defined as:

Other synonyms of discuss include talk about.

discuss (noun)	discourse (noun)
	an extended communication (often interactive) dealing with some particular topic
	extended verbal expression in speech or writing
	an address of a religious nature (usually delivered during a church service)

discuss (verb)	discourse (verb)
speak with others about (something); talk (something) over in detail; have a discussion	talk at length and formally about a topic
to consider or examine in speech or writing	carry on a conversation
	to consider or examine in speech or writing