wonder child vs nipper

wonder child and nipper both are nouns.

Word	Noun	Adjective	Verb	Adverb
wonder child	Yes	No	No	No
nipper	Yes	No	No	No

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

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

wonder child (noun)	nipper (noun)
a prodigy whose talents are recognized at an early age	a grasping structure on the limb of a crustacean or other arthropods
	a young person of either sex