The term 'more substantial' can be described by the crossword solutions of 'meatier', 'solider', 'heftier', 'LARGER', 'fatter', and 'heavier'. All of these words refer to something that is more solid, dense, and/or LARGER than something else. For example, a 'meatier' steak would be thicker and have more meat than a thinner one, while a 'solider' structure would be more stable and secure than a weaker one. Similarly, something that is 'heftier' would be heavier and more difficult to lift, while something that is 'LARGER' would be bigger in size. Finally, something that is 'fatter' or 'heavier' would have more mass and weight than something else.