jackstones vs child's game

jackstones and child's game both are nouns.

Word	Noun	Adjective	Verb	Adverb
jackstones	Yes	No	No	No
child's game	Yes	No	No	No

As nouns, child's game is a hypernym of jackstones; that is, child's game is a word with a broader meaning than jackstones:

jackstones: a game in which jackstones are thrown and picked up in various groups between bounces of a small rubber ball
child's game: a game enjoyed by children

jackstones (noun)	child's game (noun)
a game in which jackstones are thrown and picked up in various groups between bounces of a small rubber ball	a game enjoyed by children
game equipment consisting of one of several small six-pointed metal pieces that are picked up while bouncing a ball in the game of jacks