mumble vs talk

mumble and talk both are nouns.

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

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

Other hypernyms of mumble include mouth, speak, utter, verbalise, verbalize.

mumble (noun)	talk (noun)
a soft indistinct utterance	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')

mumble (verb)	talk (verb)
talk indistinctly; usually in a low voice	express in speech
grind with the gums; chew without teeth and with great difficulty	exchange thoughts; talk with
	reveal information
	use language
	deliver a lecture or talk
	divulge confidential information or secrets