Noah, as one pronounces the name in English, is pronounced No'ach
in Hebrew. (Hebrew is, of course, the language of the Bible, the so-called "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."
A Noahide is simply a human being, one of the descendants of Noah. Humankind is one family: as the Bible tells the story, Noah and his wife Na'amah are the ancestors of us all.
Jews are 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. Everyone can earn God's blessing and "get with" the holy cosmic forces that shape the Universe simply by sincerely trying to keep God's Way.
The problem is that we require information to know God's Way. It doesn't come from instinct! Neither does it come from every "teacher" who claims knowledge.
For instance: Is a stranger - perhaps someone of another race or color - entitled to life, liberty and the protection of local law, just like a native? [Yes] Is government - including laws, police, courts - a basic requirement of civilization? [Yes]
Because God is so good - the chief problem of theology is its consistent under-estimation of God's goodness - He has given us this, His Guidance, Instruction, or Way: the eternally uplifting principles of God-consciousness that constitute His Universal Torah.