Problem: What are the most important words?
cgi of plans to build apartments on the site of pub
Answer: apartment, build, site

Problem: What are the most important words?
firefighters discuss tactics whilst taking part in a simulated chemical incident
Answer: discuss, firefighter, incident, part, tactic

Problem: What are the most important words?
Several bags are covered with see through umbrellas on a beach.
Answer:
bag, beach, umbrella