discourse vs chaffer

discourse is a noun but chaffer is not a noun.

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

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

discourse (noun)	chaffer (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)	chaffer (verb)
talk at length and formally about a topic	talk socially without exchanging too much information
carry on a conversation	wrangle (over a price, terms of an agreement, etc.)
to consider or examine in speech or writing