• space
  5.41%
  There was just an open space.
• field
  2.69%
  I saw a fox run across the open field.
• mind
  2.21%
  An open mind.
• window
  2.03%
  ...an open window.
• court
  1.94%
  He forced a held ball in open court.
• seat
  1.79%
  But several open seats fell to the Republicans.
• air
  1.65%
  Loewy dined in the open air.
• arm
  1.63%
  Only greetings with open arms.
• fire
  1.59%
  No open fire?
• sky
  1.51%
  The open sky.

• anti-aircraft
  6.12%
  Anti-aircraft fire hit their plane.
• machine-gun
  6.10%
  ...a burst of machine-gun fire.
• heavy
  4.48%
  It was heavy fire.
• small
  3.83%
  There were small fires.
• israeli
  3.11%
  A Palestinian was killed by Israeli fire.
• open
  2.54%
  No open fire?
• opened
  2.11%
  Then, the man who had no criminal history, opened fire.
• hostile
  2.00%
  The hostile fire stopped.
• enemy
  1.91%
  The tank was hit by enemy fire.
• opening
  1.72%
  Each side accused the other of opening fire.