pea shooter vs plaything

pea shooter and plaything both are nouns.

Word	Noun	Adjective	Verb	Adverb
pea shooter	Yes	No	No	No
plaything	Yes	No	No	No

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

pea shooter: a straight narrow tube through which pellets (as dried peas) can be blown at a target
plaything: an artifact designed to be played with

Other hypernyms of pea shooter include toy, tube, tubing.

pea shooter (noun)	plaything (noun)
a straight narrow tube through which pellets (as dried peas) can be blown at a target	an artifact designed to be played with