sing vs talk

sing is not a noun while talk is a noun.

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

As verbs, sing and talk are synonyms defined as:

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

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

sing (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')

sing (verb)	talk (verb)
make a whining, ringing, or whistling sound	express in speech
divulge confidential information or secrets	exchange thoughts; talk with
to make melodious sounds	reveal information
produce tones with the voice	use language
deliver by singing	deliver a lecture or talk
	divulge confidential information or secrets