The term 'REALLY SURPRISE' can be broken down into two crossword solutions, SHOCK (5 letters) and STUN (4 letters). Both words are used to describe a strong emotional reaction to something unexpected. SHOCK is usually used to describe a feeling of intense surprise or dismay, while STUN is used to describe a feeling of being overwhelmed or taken aback. Both words can be used to describe a sudden and unexpected event that causes a person to feel overwhelmed or taken aback.