leapfrog vs child's game

leapfrog and child's game both are nouns.

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

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

leapfrog (noun)	child's game (noun)
a game in which one child bends down and another leaps over	a game enjoyed by children
advancing as if in the child's game, by leaping over obstacles or competitors

leapfrog (verb)	child's game (verb)
progress by large jumps instead of small increments
to vault