mag tape vs storage device

mag tape and storage device both are nouns.

Word	Noun	Adjective	Verb	Adverb
mag tape	Yes	No	No	No
storage device	Yes	No	No	No

As nouns, storage device is a hypernym of mag tape; that is, storage device is a word with a broader meaning than mag tape:

mag tape: memory device consisting of a long thin plastic strip coated with iron oxide; used to record audio or video signals or to store computer information
storage device: a device that preserves information for retrieval

Other hypernyms of mag tape include memory device.

mag tape (noun)	storage device (noun)
memory device consisting of a long thin plastic strip coated with iron oxide; used to record audio or video signals or to store computer information	a device that preserves information for retrieval