When I have a physical experience, sometimes it results in me saying a word.

Now, maybe there are other possible experiences that would result in me behaving identically, such that from my behavior (including what words I say) it is impossible to distinguish between different potential experiences I could have had.

But, “caused me to say” is a relation, is it not?

Unless you want to say that it wasn’t the experience that caused me to do something, but some physical thing that went along with the experience, either causing or co-occurring with the experience, and also causing me to say the word I said. But, that would still be a relation, I think.