teeter-totter vs plaything

teeter-totter and plaything both are nouns.

Word	Noun	Adjective	Verb	Adverb
teeter-totter	Yes	No	Yes	No
plaything	Yes	No	No	No

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

teeter-totter: a plaything consisting of a board balanced on a fulcrum; the board is ridden up and down by children at either end
plaything: an artifact designed to be played with

Other hypernyms of teeter-totter include toy.

teeter-totter (noun)	plaything (noun)
a plaything consisting of a board balanced on a fulcrum; the board is ridden up and down by children at either end	an artifact designed to be played with

teeter-totter (verb)	plaything (verb)
ride on a plank