discourse vs evangelism

discourse and evangelism both are nouns.

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

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

discourse: an address of a religious nature (usually delivered during a church service)
evangelism: zealous preaching and advocacy of the gospel

Other hyponyms of discourse include baccalaureate, kerugma, kerygma, homily, preachment.

discourse (noun)	evangelism (noun)
an extended communication (often interactive) dealing with some particular topic	zealous preaching and advocacy of the gospel
extended verbal expression in speech or writing
an address of a religious nature (usually delivered during a church service)

discourse (verb)	evangelism (verb)
talk at length and formally about a topic
carry on a conversation
to consider or examine in speech or writing