White lather is a substance that appears when a liquid is agitated or stirred vigorously. There are several synonyms for white lather, such as froth, foam, and head. Other commonly used synonyms include bubbles, spume, and suds. White lather can also be referred to as a scum or film when it appears on the surface of a liquid. Regardless of the chosen synonym, the appearance of white lather generally implies that the liquid has been thoroughly mixed or shaken. This can be the result of a variety of factors, such as stirring a cup of coffee or vigorously washing one's hands.