discourse vs talk

discourse and talk both are nouns.

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

As nouns, talk is a hyponym of discourse; that is, talk is a word with a more specific, narrower meaning than discourse:

discourse: an extended communication (often interactive) dealing with some particular topic
talk: discussion; (`talk about' is a less formal alternative for `discussion of')

Other hyponyms of discourse include detail, dilation, consideration, elaboration, enlargement, expansion.

As verbs, talk is a hypernym of discourse; that is, talk is a word with a broader meaning than discourse:

Other hypernyms of discourse include speak.

As verbs, talk is a hypernym of discourse; that is, talk is a word with a broader meaning than discourse:

Other hypernyms of discourse include speak.

discourse (noun)	talk (noun)
an extended communication (often interactive) dealing with some particular topic	the act of giving a talk to an audience
extended verbal expression in speech or writing	an exchange of ideas via conversation
an address of a religious nature (usually delivered during a church service)	idle gossip or rumor
	a speech that is open to the public
	discussion; (`talk about' is a less formal alternative for `discussion of')

discourse (verb)	talk (verb)
talk at length and formally about a topic	express in speech
carry on a conversation	exchange thoughts; talk with
to consider or examine in speech or writing	reveal information
	use language
	deliver a lecture or talk
	divulge confidential information or secrets