Correct Answer: PAIN

Solution : Given:

PRECIPITATE

Let's compare all the option words with the given word.
First option: PAIR; All the letters of PAIR are present in the word PRECIPITATE .
Second option: PART; All the letters of PART are present in the word PRECIPITATE .
Third option: RECITE; All the letters of RECITE are present in the word PRECITIPATE.
Fourth option: PAIN; N is not present in the word PRECIPITATE. Therefore, all the letters of PAIN are not present in the word PRECITIPATE.

Hence, the fourth option is correct.