leapfrog vs onward motion

leapfrog and onward motion both are nouns.

Word	Noun	Adjective	Verb	Adverb
leapfrog	Yes	No	Yes	No
onward motion	Yes	No	No	No

As nouns, onward motion is a hypernym of leapfrog; that is, onward motion is a word with a broader meaning than leapfrog:

leapfrog: advancing as if in the child's game, by leaping over obstacles or competitors
onward motion: the act of moving forward (as toward a goal)

Other hypernyms of leapfrog include advance, advancement, forward motion, procession, progress, progression.

leapfrog (noun)	onward motion (noun)
a game in which one child bends down and another leaps over	the act of moving forward (as toward a goal)
advancing as if in the child's game, by leaping over obstacles or competitors

leapfrog (verb)	onward motion (verb)
progress by large jumps instead of small increments
to vault