talking book vs sound recording

talking book and sound recording both are nouns.

Word	Noun	Adjective	Verb	Adverb
talking book	Yes	No	No	No
sound recording	Yes	No	No	No

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

talking book: sound recording of someone reading a book; frequently used by blind people
sound recording: a recording of acoustic signals

Other hypernyms of talking book include audio, audio recording.

talking book (noun)	sound recording (noun)
sound recording of someone reading a book; frequently used by blind people	a recording of acoustic signals