Here’s my version of the puzzle that’s on Pentrace, for a little while, but with 39 pen names instead of 38. I also included a joke that almost spelled out the missing word, just to show that I could have included it. As a hint, it’s spelled backwards. I also added the word “ZEN”, which is also a pen name, so that’s an even 40, but I think there’s room for a prime 43 names. The original puzzle is from the Journal of the Writing Equipment Society, Summer 2011.