One of the hardest words in Hangman is Jazz. Jazz is great because it includes J and Z, two of the most uncommon letters in the alphabet. Along with this, it only has 3 letters in it, which makes it harder for players to guess. Other great options are words that don’t use the typical A, E, I, O, and U vowels. Some great examples are psych and synth. Both will be hard for opponents to guess due to their lack of vowels.