child prodigy vs nestling

child prodigy and nestling both are nouns.

Word	Noun	Adjective	Verb	Adverb
child prodigy	Yes	No	No	No
nestling	Yes	No	No	No

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

Other hypernyms of child prodigy include child, fry, kid, minor, nipper, shaver, small fry, tiddler, tike, tyke, youngster, prodigy.

child prodigy (noun)	nestling (noun)
a prodigy whose talents are recognized at an early age	young bird not yet fledged
	a young person of either sex