audio recording vs recording

audio recording and recording both are nouns.

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

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

audio recording: a recording of acoustic signals
recording: a storage device on which information (sounds or images) have been recorded

audio recording (noun)	recording (noun)
a recording of acoustic signals	the act of making a record (especially an audio record)
	a signal that encodes something (e.g., picture or sound) that has been recorded
	a storage device on which information (sounds or images) have been recorded