stereo system vs reproducer

stereo system and reproducer both are nouns.

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

As nouns, reproducer is a hypernym of stereo system; that is, reproducer is a word with a broader meaning than stereo system:

stereo system: reproducer in which two microphones feed two or more loudspeakers to give a three-dimensional effect to the sound
reproducer: an audio system that can reproduce and amplify signals to produce sound

stereo system (noun)	reproducer (noun)
reproducer in which two microphones feed two or more loudspeakers to give a three-dimensional effect to the sound	an audio system that can reproduce and amplify signals to produce sound