The term 'less abundant' can be described by the crossword solutions of 'rarer, ' 'sparser, ' 'SCARCER, ' and 'scanter.' All of these words refer to something that is not as plentiful or common as something else. 'Rarer' means that something is not seen or found very often, while 'sparser' means that something is spread out over a large area with few instances of it. 'SCARCER' means that something is not as available as it once was, and 'scanter' means that something is not as plentiful as it should be. All of these words refer to something that is less abundant than something else.