These are the difficulty names and their respective words that I have chosen to use
Easy: University
words: 1.lab 2.hal 3.math 4.whiteboard 5.class
Medium: Bank
words: 1.deposit 2.transaction 3.security 4.credit 5.vault
Hard: Pentagon
words: 1.headquarters 2.ground zero 3.department 4.counterdrug 5.Legislative