audiotape vs magnetic tape

audiotape and magnetic tape both are nouns.

Word	Noun	Adjective	Verb	Adverb
audiotape	Yes	No	No	No
magnetic tape	Yes	No	No	No

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

audiotape: magnetic tape for use in recording sound
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

Other hypernyms of audiotape include mag tape, tape.

audiotape (noun)	magnetic tape (noun)
magnetic tape for use in recording sound	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 tape recording of sound