converse vs speak

converse is a noun but speak is not a noun.

Word	Noun	Adjective	Verb	Adverb
converse	Yes	Yes	Yes	No
speak	No	No	Yes	No

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

Other hypernyms of converse include talk.

converse (noun)	speak (noun)
a proposition obtained by conversion

converse (adjective)	speak (adjective)
of words so related that one reverses the relation denoted by the other
turned about in order or relation

converse (verb)	speak (verb)
carry on a conversation	express in speech
	exchange thoughts; talk with
	use language
	give a speech to
	make a characteristic or natural sound