Can You Figure Out The Words?

Can you figure out what the words are?

1. The first word means "a large group of people".
2. The second word is "a king's headgear". This word is formed by replacing a letter in the first word with another letter.
3. The third word is "a comic performer". This word is formed by replacing a letter in the second word with another letter.
4. The fourth word means "moved by the wind". This word is formed by replacing a letter in the third word with another letter.