Hey Roberto! You won't find any difference between the meanings - strictly speaking. Here the difference between "ξυλου" and "σταυρού" is a matter of style and sentiment and not a matter of meaning. That's also the point of using a "Figure of speech": it can make the language more vivid, more illustrative by touching some particular chords of our sentimental world. I don't know if I helped in your question, I hope I did! Kind regards, Roberto!

That is a good point, Stergios. And thanks indeed for your comment. My point is exactly that - Synecdoche is a "figure of speech" according to wikipedia. Now, regarding the biblical text, figures of speech might not entirely stick to the truth, because they are just that - figures of speech. Strictly speaking, "ξύλου" means "wood" according to google translator as well. It has also been translated as "wood" in some other Bible translations. I wanted to ask to current native speakers for that meaning, which maybe it has changed through synecdoche associations from the original meaning of the word "ξύλου". Kind regards, my friend.

Hello Roberto here "ξύλου" refers to "Cross" as Maria said. But the question is why? It's a Figure of Speech(Σχήμα λόγου) that is called Synecdoche(Συνεκδοχή), where "a term for a part of something refers to the whole of something or vice versa". A common english example would be the word "suits" that refers to "businesspeople". You can find more in the wikipedia page: https://en.wikipedia.org/wiki/Synecdoche I hope that clarifies completely the problem you encountered :)

You're welcome!))

Thank you very much, Maria.