jam box vs stereophony

jam box and stereophony both are nouns.

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

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

jam 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 jam box include stereo, stereo system, stereophonic system.

jam 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