The term 'PROD INTO ACTION' can be summarized by two crossword solutions: NUDGE (5 letters) and GOAD (4 letters). NUDGE is an action that encourages someone to do something without being forceful or coercive. It is often used as a gentle reminder or suggestion. GOAD, on the other hand, is a more aggressive form of encouragement. It is used to provoke someone into taking action, usually through criticism or ridicule. Both terms are used to motivate people to take action.