Sound vs Audio (terminology)

I’ve been thinking the last few days about the difference between the words “Sound” and “Audio”. In many respects, they are synonymous, and I’ve noticed that my usage is inconsistent.

For example: Am I a Sound Designer or Audio Designer?

Sometimes using one word over the other feels right because we often hear them combined with other words:

1. Audio Technology
2. Sound Effects
3. Sound Track (of a film)
4. Audio- visual

Then the difference came to me when thinking in plurals. You can have many sounds but not many audios. So audio is the general word, referring to the whole, and sound is the more specific word, referring to a specific instance of a noise.

But I still don’t have an answer to the question above…

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