In tasks 21–25 answer the questions with one word

In tasks 21–25 answer the questions with one word. Inbrackets you have the number of letters that your answer must contain: 21. What is the opposite of the word top? (6) 22. Out of which verb the noun competition is made? (7) 23. What is the opposite of shallow? (4) 24. How do you call sports that are very dangerous for your life? (7) 25. How do you call a giant wave that can cause terrible damage? (7)