jungle gym vs plaything

jungle gym and plaything both are nouns.

Word	Noun	Adjective	Verb	Adverb
jungle gym	Yes	No	No	No
plaything	Yes	No	No	No

As nouns, plaything is a hypernym of jungle gym; that is, plaything is a word with a broader meaning than jungle gym:

jungle gym: a structure of vertical and horizontal rods where children can climb and play
plaything: an artifact designed to be played with

Other hypernyms of jungle gym include toy, construction, structure.

jungle gym (noun)	plaything (noun)
a structure of vertical and horizontal rods where children can climb and play	an artifact designed to be played with