death knell vs prodigy

death knell and prodigy both are nouns.

Word	Noun	Adjective	Verb	Adverb
death knell	Yes	No	No	No
prodigy	Yes	No	No	No

As nouns, prodigy is a hypernym of death knell; that is, prodigy is a word with a broader meaning than death knell:

Other hypernyms of death knell include omen, portent, presage, prognostic, prognostication.

death knell (noun)	prodigy (noun)
a bell rung to announce a death	an impressive or wonderful example of a particular quality
an omen of death or destruction	a sign of something about to happen
	an unusually gifted or intelligent (young) person; someone whose talents excite wonder and admiration