seesaw vs plaything

seesaw and plaything both are nouns.

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

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

seesaw: 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 seesaw include toy.

seesaw (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

seesaw (verb)	plaything (verb)
move up and down as if on a seesaw
ride on a plank
move unsteadily, with a rocking motion