boom box vs stereophony

boom box and stereophony both are nouns.

Word	Noun	Adjective	Verb	Adverb
boom box	Yes	No	No	No
stereophony	Yes	No	No	No

As nouns, stereophony is a hypernym of boom box; that is, stereophony is a word with a broader meaning than boom box:

boom box: a portable stereo
stereophony: reproducer in which two microphones feed two or more loudspeakers to give a three-dimensional effect to the sound

Other hypernyms of boom box include stereo, stereo system, stereophonic system.

boom box (noun)	stereophony (noun)
a portable stereo	reproducer in which two microphones feed two or more loudspeakers to give a three-dimensional effect to the sound