speak vs talk

speak is not a noun while talk is a noun.

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

As verbs, speak and talk are synonyms defined as:

Other synonyms of speak include mouth, utter, verbalise, verbalize.

As verbs, speak and talk are synonyms defined as:

As verbs, speak and talk are synonyms defined as:

speak (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')

speak (verb)	talk (verb)
express in speech	express in speech
exchange thoughts; talk with	exchange thoughts; talk with
use language	reveal information
give a speech to	use language
make a characteristic or natural sound	deliver a lecture or talk
	divulge confidential information or secrets