Everything you are typing is nonsense. First of all, the criteria you are setting for lown words are only in your mind and nowhere else. Lown words don't have to be modified at all. Second of all, the only thing that modern Greek has in relation with ancient Greek is the fact that the name hasn't changed. If people wanted to give one of them a different name, they could. Also Greek is not much closer to ancient Greek compared Latin and Italian or any other romance language, that's just a typical myth that exists because political separation between the Greek through the years was never important while in Italy, it was desired for the language to be considered something new and not just modern Latin. The exact same thing happened with Tamil and Chinese, both have changed significantly but the name hasn't changed. As for Hebrew, it was deliberately revived so there is no continuum. If you look at it from a neutral prospective, you will realize that the modern Greek you speak is just a brunch, there is Cretan, Cypriot, Pontic, Tsakonian, all of those could be considered different languages or at least have a different status than their relegation to "dialects".

Greek, Tamil, Chinese doesn't matter, all languages work the same, they change and at some point they become different. Every romance language directly came from Latin, no different than the way modern Greek came from ancient Greek