I'm not sure exactly what you mean by white sauce.
The most common sauce referred to as white sauce is "alfredo sauce" made from a mixture of butter, heavy cream, and Parmesan cheese. It could also refer to any number of white wine based sauces, cheese or cream based sauces or chowders, etc.
Roux
The flour used in the making of white sauce thickens as it cooks in the milk. Flour is used the thicken a lot of soups, stews, and sauces.
beef stroganoff
Chicken Blanquette
pink sauce
horse sauce
Raspberry sauce.
As the name "Tomato sauce" suggests, tomato sauce is a sauce who's main ingredient is tomatos.
Black Day (April 14) is a South Korean informal tradition for single people to get together and eat jajangmyeon (white Korean noodles with black bean sauce), sometimes a white sauce is mixed for those who did not celebrate White Day.The idea is that those who did not give or receive gifts on Valentine's Day (February 14) or White Day (March 14) can get together and eat jajangmyeon (white Korean noodles with black bean sauce) hence the name, to celebrate being single.
Hoisin sauce is also known as Peking Sauce.
Duck sauce
tartar sauce?
It is known as "mole sauce".