kaleidoscope vs plaything

kaleidoscope and plaything both are nouns.

Word	Noun	Adjective	Verb	Adverb
kaleidoscope	Yes	No	No	No
plaything	Yes	No	No	No

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

kaleidoscope: an optical toy in a tube; it produces symmetrical patterns as bits of colored glass are reflected by mirrors
plaything: an artifact designed to be played with

Other hypernyms of kaleidoscope include toy.

kaleidoscope (noun)	plaything (noun)
an optical toy in a tube; it produces symmetrical patterns as bits of colored glass are reflected by mirrors	an artifact designed to be played with
a complex pattern of constantly changing colors and shapes