The term 'FULL OF FOAM' can be described by two crossword solutions: 'SUDSY' (5 letters) and 'LATHERY' (7 letters). 'SUDSY' is an adjective that describes something that is full of suds, which are the bubbles created when soap is mixed with water. 'Lathery' is an adjective that describes something that is full of lather, which is a frothy substance created when soap is mixed with water. Therefore, the term 'FULL OF FOAM' can be used to describe something that is full of suds or lather, both of which are created when soap is mixed with water.