There are several synonyms for the term "sourmilk cheese." One commonly used synonym for this type of cheese is "quark." Quark is a fresh, soft cheese that is made by curdling milk with an acid like vinegar or lemon juice. Another synonym for sourmilk cheese is "curds and whey." These are the two components that are created when milk is curdled. The curds are the solid portion of the milk, which are used to make cheese, while the whey is the liquid portion. Cottage cheese is also sometimes used as a synonym for sourmilk cheese, although cottage cheese is usually made with milk that has been cultured with a specific type of bacteria.