iPod vs stereophonic system

iPod and stereophonic system both are nouns.

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

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

iPod: (trademark) a pocket-sized device used to play music files
stereophonic system: reproducer in which two microphones feed two or more loudspeakers to give a three-dimensional effect to the sound

Other hypernyms of iPod include stereo, stereo system, stereophony.

iPod (noun)	stereophonic system (noun)
(trademark) a pocket-sized device used to play music files	reproducer in which two microphones feed two or more loudspeakers to give a three-dimensional effect to the sound