prophesy vs talk

prophesy is not a noun while talk is a noun.

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

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

Other hypernyms of prophesy include lecture.

prophesy (noun)	talk (noun)
	the act of giving a talk to an audience
	an exchange of ideas via conversation
	idle gossip or rumor
	a speech that is open to the public
	discussion; (`talk about' is a less formal alternative for `discussion of')

prophesy (verb)	talk (verb)
predict or reveal through, or as if through, divine inspiration	express in speech
deliver a sermon	exchange thoughts; talk with
	reveal information
	use language
	deliver a lecture or talk
	divulge confidential information or secrets