눈꽃

눈 = snow (also "eye," but in this case "snow");
꽃 = flower;
therefore, 눈꽃 = snow flower, and you use it to refer to the snow that piles up on top of tree branches after a heavy snowfall.

눈 is pronounced "noon," and 꽃 is pronounced "goat." So: noongoat. Say it quickly, and let the "g" get stuck in your throat a little.