stereophonic system vs stereo system

stereophonic system and stereo system both are nouns.

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

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

stereophonic system 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 stereophonic system include stereo, stereophony.

stereophonic system (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