The term 'spark' can be defined as an action or event that serves as a CATALYST for something else. The crossword solutions for this term include 'ENERGIZE' (8 letters), 'ELAN' (4 letters), 'EXCITE' (6 letters), 'GERM' (4 letters), 'AROUSE' (6 letters), 'INCITE' (6 letters), 'ANIMATE' (7 letters), 'INSPIRE' (7 letters), 'TRIGGER' (7 letters), 'CATALYST' (8 letters), and 'jumpstart' (9 letters). All of these words refer to actions that can spark something else, such as energizing, exciting, arousing, inciting, animating, inspiring, triggering, catalyzing, and jumpstarting.