The term 'more vast' can be described by three crossword solutions: 'grander' (7 letters), 'huger' (5 letters), and 'wider' (5 letters). All three words refer to something that is larger in size or scope than something else. Grander implies a greater degree of grandeur, huger suggests a greater degree of hugeness, and wider implies a greater degree of width. Together, these three words suggest something that is much larger than what it is being compared to.