Wiktionary
second-guessers
n. (plural of second-guesser English)
Usage examples of "second-guessers".
The second-guessers would have it that I was remiss in not advising caution more strongly.
Furthermore I doubt if some of the smart second-guessers know all the facts.
The television crews went home, and second-guessers around the world explained how the affair should have been handled.