jump rope vs child's game

jump rope and child's game both are nouns.

Word	Noun	Adjective	Verb	Adverb
jump rope	Yes	No	No	No
child's game	Yes	No	No	No

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

jump rope: a child's game or a cardiopulmonary exercise in which the player jumps over a swinging rope
child's game: a game enjoyed by children

Other hypernyms of jump rope include cardiopulmonary exercise.

jump rope (noun)	child's game (noun)
a child's game or a cardiopulmonary exercise in which the player jumps over a swinging rope	a game enjoyed by children
a length of rope (usually with handles on each end) that is swung around while someone jumps over it