talk of vs speak

talk of and speak both are verbs.

Word	Noun	Adjective	Verb	Adverb
talk of	No	No	Yes	No
speak	No	No	Yes	No

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

Other hypernyms of talk of include mouth, talk, utter, verbalise, verbalize.

talk of (verb)	speak (verb)
discuss or mention	express in speech
	exchange thoughts; talk with
	use language
	give a speech to
	make a characteristic or natural sound