discourse vs discuss

discourse is a noun but discuss is not a noun.

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

As verbs, discourse and discuss are synonyms defined as:

Other synonyms of discourse include talk about.

discourse (noun)	discuss (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)

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