Well, if they have hearing, they can build a world model based on that sensation. So when someone talks about the fall, they can remember the sound of leaves hitting other leaves when they fall. The senses give us measurement data on reality that we use to then model reality. We humans then can create concepts about that experience, and then ultimately communicate with other using common words to communication that conceptual understanding. Word data alone is just word data with no meaning. This is why when I look at a paragraph in Russian, it has no meaning for me. (As I don't understand Russian)