prodigy vs girl wonder

prodigy and girl wonder both are nouns.

Word	Noun	Adjective	Verb	Adverb
prodigy	Yes	No	No	No
girl wonder	Yes	No	No	No

As nouns, girl wonder is a hyponym of prodigy; that is, girl wonder is a word with a more specific, narrower meaning than prodigy:

prodigy: an unusually gifted or intelligent (young) person; someone whose talents excite wonder and admiration
girl wonder: an extremely talented young female person

Other hyponyms of prodigy include boy wonder, child prodigy, infant prodigy, wonder child.

prodigy (noun)	girl wonder (noun)
an impressive or wonderful example of a particular quality	an extremely talented young female person
a sign of something about to happen
an unusually gifted or intelligent (young) person; someone whose talents excite wonder and admiration