stereophony vs stereo system

stereophony and stereo system both are nouns.

Word	Noun	Adjective	Verb	Adverb
stereophony	Yes	No	No	No
stereo system	Yes	No	No	No

As nouns, stereophony and stereo system are synonyms defined as:

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

Other synonyms of stereophony include stereo, stereophonic system.

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