audio recording vs audio

audio recording and audio both are nouns.

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

As nouns, audio recording and audio are synonyms defined as:

Other synonyms of audio recording include sound recording.

audio recording (noun)	audio (noun)
a recording of acoustic signals	the sound elements of television
	a recording of acoustic signals
	an audible acoustic wave frequency
	the audible part of a transmitted signal