Bubbles Up is a term used to describe the process of a liquid rising to the surface due to the formation of bubbles. The crossword solutions SUDSES (6 letters), FOAMS (5 letters), and SEETHES (7 letters) all refer to this process. SUDSES is an alternate spelling of suds, which are the foam created when soap is mixed with water. FOAMS refers to the foam created when air is mixed with a liquid. SEETHES is another word for boiling, which is when a liquid is heated to its boiling point and bubbles form on the surface.