People can agree about all the facts but argue about what the word means, which question is an empirical one. People don't know what their criteria are for something being a sound, and can only offer aspects that seem to count for it or against it. You have to try the argument and see if you can see it that way.

Perhaps in the end you can bring out what a sound is.

See Cavell on chairs, op cit. and derivatively Wittgenstein.

The people arguing are not making a mistake; the cognitive scientist is.