Here are some examples of words using the "gwy" prefix:
* gwyrdd - green (literally "white-red")
* gwyn - white
* gwydd - knowledge (literally "bright knowledge")
* gwynt - wind (literally "bright breath")
It's important to note that the meaning of the prefix can sometimes be slightly nuanced depending on the context. For example, "gwyrdd" doesn't just mean "white-red" but rather "green" because it's a color that looks like a mixture of white and red.