audiotape vs audio recording

audiotape and audio recording both are nouns.

Word	Noun	Adjective	Verb	Adverb
audiotape	Yes	No	No	No
audio recording	Yes	No	No	No

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

Other hypernyms of audiotape include audio, sound recording, tape, tape recording, taping.

audiotape (noun)	audio recording (noun)
magnetic tape for use in recording sound	a recording of acoustic signals
a tape recording of sound