stick horse vs plaything

stick horse and plaything both are nouns.

Word	Noun	Adjective	Verb	Adverb
stick horse	Yes	No	No	No
plaything	Yes	No	No	No

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

stick horse: a child's plaything consisting on an imitation horse's head on one end of a stick
plaything: an artifact designed to be played with

Other hypernyms of stick horse include toy.

stick horse (noun)	plaything (noun)
a child's plaything consisting on an imitation horse's head on one end of a stick	an artifact designed to be played with