The term 'force or drive back' can be summarized by two crossword solutions: 'REPEL' (5 letters) and 'REPULSE' (7 letters). Both words refer to the act of pushing something away, either physically or emotionally. REPEL is a stronger word than REPULSE, as it implies a more forceful action. REPULSE is more often used to describe an emotional reaction, such as disgust or revulsion. Both words are used to describe a situation in which someone or something is being pushed away.