mag tape vs audiotape

mag tape and audiotape both are nouns.

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

As nouns, audiotape is a hyponym of mag tape; that is, audiotape is a word with a more specific, narrower 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
audiotape: magnetic tape for use in recording sound

Other hyponyms of mag tape include cassette tape, magnetic stripe, videotape.

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