soundbox vs cavity resonator

soundbox and cavity resonator both are nouns.

Word	Noun	Adjective	Verb	Adverb
soundbox	Yes	No	No	No
cavity resonator	Yes	No	No	No

As nouns, cavity resonator is a hypernym of soundbox; that is, cavity resonator is a word with a broader meaning than soundbox:

soundbox: a resonating chamber in a musical instrument (as the body of a violin)
cavity resonator: a hollow chamber whose dimensions allow the resonant oscillation of electromagnetic or acoustic waves

Other hypernyms of soundbox include resonating chamber, resonator.

soundbox (noun)	cavity resonator (noun)
a resonating chamber in a musical instrument (as the body of a violin)	a hollow chamber whose dimensions allow the resonant oscillation of electromagnetic or acoustic waves