What kind of white bird with a large yellow beek and black tipped wings?

The bird you are describing sounds like the Great Egret, which is a large white bird known for its striking appearance. However, if you are specifically referring to a bird with a large yellow beak and black-tipped wings, it might be the American White Pelican, which has a large yellow bill and predominantly white feathers with black on the wings. Both species are often found near water bodies and are known for their graceful flight and distinct coloration.