Related by context. Frequent words. (Click for all words.) 56 terrorist attacks 45 post-#/# [001] 44 bin Laden 44 Twin Towers 44 WTC 43 Bin Laden 41 Osama bin Laden 41 Ground Zero 40 Osama Bin Laden 40 twin towers 40 Pearl Harbor 39 Lower Manhattan 39 hijackers 39 hijackings 38 terror 37 atrocity 37 terrorist 37 USS Cole 36 Zacarias Moussaoui 36 airliners 36 Trade 36 Khalid Sheikh Mohammed 36 Moussaoui 36 shoe bomber 36 attacks 36 counterterrorism 35 National Counterterrorism 35 bombing 35 Lee Harvey Oswald 35 Detroit bound airliner 35 terrorists 35 airliner 35 Binalshibh 35 Chertoff 34 Timothy McVeigh 34 Ronald Reagan 34 jetliners 34 terror plots 34 Bali bombings 34 counter terrorism 34 Great Depression 34 Zarqawi 34 al Qaeda 33 tragedy 33 Yasser Arafat 33 al Qa'ida 33 jetliner 33 bioterrorism 33 KSM 33 J. Edgar Hoover 33 Awlaki 33 heroism 33 Auschwitz 33 Holocaust 33 Airlines Flight 33 Terrorist 33 al Zarqawi 33 Patriot Act 33 JFK 33 homeland security 33 antiterrorism 33 hijacker 33 NYPD 33 Pentagon 33 terrorism 33 Mayor Rudolph Giuliani 32 Lockerbie bombing 32 mastermind Khalid Sheikh Mohammed 32 jihadists 32 Abdulmutallab 32 Al Qaeda 32 radical Islam 32 Berlin Wall 32 combating terrorism 32 AQAP 32 Terrorism 32 Umar Farouk Abdulmutallab 32 Abu Zubaydah 31 counterterror 31 Reagan 31 al Qaeda operatives 31 Terror 31 Hitler 31 Michael Chertoff 31 foiled plot 31 Hurricane Katrina 31 anthrax 31 Islamophobia 31 Babri Masjid 31 Brooklyn Bridge 31 radicalization 31 Leiter 31 Airways Flight 31 McCarthyism 31 WMD 31 CIA 31 John Ashcroft 31 John F. Kennedy 31 MI5 31 Islamic extremists 31 assassination