The term 'WHAT'S MORE' can be solved by the crossword solutions PLUS (4 letters), AND (3 letters), ALSO (4 letters), AND EXTRA (5 letters). These words all have similar meanings, with PLUS AND EXTRA being more emphatic than AND and ALSO. PLUS AND EXTRA both suggest an additional amount or quality, while AND and ALSO suggest a continuation of the same amount or quality. Together, these words can be used to express that there is something more than what has already been mentioned.