Noah, as one pronounces the name in English, is pronounced No'ach
Hebrew is the language of the Bible, the "Old Testament."
The "ach" in No'ach is pronounced like the German "Ach!" (Ach du lieber! Achtung!) or like the guttural sound in the Scottish word for lake, "loch."
Noahide means "human," basically. All of us descend from Noah (or No'ach.) Humankind is just one family. As the Bible tells the story, Noah and his wife Na'amah are the ancestors of us all.
As for Israel, the world's Jews constitute a Noahide tribe, but usually "Noahide" refers to non-Jews, the vast majority of the human race - to the more than 99.80% of humankind which isn't Jewish.
(Another word for Noahide is Noahite. Some very old reference books also refer to Noahides as Noachians.)
Every Noahide - every human being - comes into the world with a pure soul. [This is a basic principle of reality. Some religions deny it, but it's the esssence of true religion - "Old Testament" religion.] Put it this way: everyone can and should earn God's blessing and "get with" the holy cosmic forces that shape the Universe simply by sincerely trying to please God.
(No one needs to die for your sins for you, in other words. It's up to you how, and to what extent, you get with God and holiness)
A small problem here is that we require information to find God's Path, to know how to please God. Human knowledge doesn't come from mere instinct. And, unfortunately, mortal teachers are notoriously unreliable.
Is a stranger - perhaps someone of another race or color - entitled to life, liberty and the protection of local law, just like your spouse or neighbor? Is government - including laws, police, courts - a necessary to civilization? Is it a basic human duty to strive for justice in the world and, by so doing, honor God?
("Yes," to all above. But instinct didn't teach that to you. Neither did certain teachers.)
Because God is so good - the chief problem of man's created theologies are their consistent under-estimation of God's goodness - He has given us this, His Guidance, His Instruction, His Torah: the eternally uplifting principles of God-consciousness of Torah and true Noahism.