I found several egg wracks washed up on the beach.

The beach was covered in knotted wracks.

The beach was covered in spiral wracks.

The nerve-wracks of the situation were overwhelming.

The nerve wracks I experienced before the exam were unbearable.

The job interview was a nerve-wrack.

The nerve wrack I felt before the job interview was overwhelming.

I found a lot of interesting shells on the wrack line.

The wrack lines on the beach indicated the high tide.

I've been wracking my brains trying to solve this puzzle.