The term VAST MULTITUDE can be broken down into three crossword solutions: LEGION (6 letters), HORDE (5 letters), and HOST (4 letters). All three terms refer to a large group of people or things. A LEGION is a large military unit, usually consisting of thousands of soldiers. A HORDE is a large, often unruly, crowd of people. A HOST is a large number of people or things gathered together. All three words are used to describe a large group of people or things, and the term VAST MULTITUDE is an appropriate way to describe such a group.