Hint 1: There is a V in words 1 and 8. Hint 2: There is a Y in words 2 and 4. Hint 3: There is an M in word 6 only. Hint 4: There is an S in word 3 only.
Hint 5: There is a repeated letter in words 1 and 6. Hint 6: There is a double letter in words 2 and 4. Hint 7: Here are the starting letters of each word: