magnetic tape vs memory device

magnetic tape and memory device both are nouns.

Word	Noun	Adjective	Verb	Adverb
magnetic tape	Yes	No	No	No
memory device	Yes	No	No	No

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

magnetic 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
memory device: a device that preserves information for retrieval

Other hypernyms of magnetic tape include storage device.

magnetic tape (noun)	memory 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